Hub Airports, Repetitive Airplane Noise, and Hypertension

A sobering read. Also, a growing body of evidence supporting the need for sleep-hour curfews, local control, and scaling back the over-scheduling common at the largest U.S. hub airports.

Click on the image below for a scrollable view; click here to download the PDF file.

See also:

NYC Mayoral Debate: Will Airport Impacts be Discussed?

Can we find just one candidate for elected office who prioritizes community health and quality-of-life? Who will fight for balance, to empower local airport curfews and limits on hourly operations at impactful hub airports? Sal Albanese may be the answer for New York City. Check out the debate this week…

Click on the image below for a scrollable view; the PDF file may be downloaded.

(…thanks to, the source for this info!)

A Work-Around to FAA’s Failed Noise Models

This Post looks at how a simple and economical noise study for a large park and natural area suggests a better way to study airport noise. It essentially presents a work-around to two root problems in how FAA and industry ‘collaborate’ to obstruct aviation noise activism:

  1. that FAA knowingly uses noise metrics and noise models that work great for the airlines – since they completely fail to define and mitigate aviation noise impacts, but work terribly for people – since they consistently fail to objectively quantify noise and impacts; and,
  2. that, whenever citizens approach FAA or airport authorities with their concerns, and seek hard data to help define and fix the problems, both FAA and airport authorities routinely withhold that data, and instead work to confuse and disillusion these activists.

The Boston (Logan) Noise Impacts

In recent years, FAA has become extremely accommodating to hub airlines, by no longer pushing back against excessive flight scheduling. At Boston Logan [KBOS], the airport configuration allowing the highest capacity in terms of ‘runway throughput’ or operations per hour, includes using the parallel runways 4L and 4R for arrivals. KBOS has major hub operations by JetBlue, and minor hub operations by American and Delta. So, with FAA intensifying the use of runways 4L and 4R for arrivals, even in crosswind and slight tailwind conditions, they are imposing an enormous noise and air pollutant burden on communities under the straight-in arrival corridor.

The impact upon communities below, such as Milton, has been intense. People are losing sleep (the short term impact) and breathing more aviation pollutants (which will cause serious long-term health impacts). They are complaining to both FAA and the airport authority, Massport, as well as to their elected reps and local community officials. Their complaints continue to be broadly ignored by the key authorities – FAA and Massport – both of whom routinely reply that ‘nothing has changed’ and ‘the perceived impacts are not significant by our standards’. Needless to say, this mishandling by FAA and Massport only infuriates and further sensitizes the impacted communities.

Something has to change. FAA/Massport must stop pretending to comply with federal and state environmental impact assessment processes, which they do by using worthless impact models. Frankly, these models were designed to create an illusion that impacts are objectively measured, and they were also designed to bias the conclusions to ensure validation of any and all airport operational expansions. We need a new model that is objective; a model with people collecting REAL noise data and compiling it into impact contours may be the best way to go.

Noise Modeling at Blue Hills Reservation

The Blue Hills Reservation includes 125-miles of trails on 7,000 acres. A prominent water body in this natural area is Houghton’s Pond, which happens to be under the straight-in approach to runways 4L and 4R, at approximately 11-miles from the landing threshold.

Friends of the Blue Hills is a local non-profit organization that coordinates volunteers and works to preserve and protect this wonderful natural resource. A recent Post at their blog announced a great project. It looks like Boston University is doing a noise study; professor Richard Primack and doctoral student Lucy Zipf appear to be crowd-sourcing the use of an iphone app by volunteer hikers, to compile an actual noise map of the trails for most or even all 7,000 acres of Blue Hills Reservation.It will be very interesting to see what they produce. Seemingly, if the app-devices are synchronized, they could create a noise contour map that would show actual noise levels at any one time. Further, a collection of maps could be created, so that noise impacts for varying conditions can be compared.

How This Might Be Used For Aviation Noise Impacts

The app and methodologies could easily be applied to a residential community, such as Milton (or Des Moines, WA; or Cabin John, MD; or Palo Alto, CA; etc.). What’s to stop a local activist group from staging a grid of 4- or 6- or even dozens of devices at mapped street locations in Milton, and compiling the data into maps that show REAL decibel-level impacts? What’s to stop that same group from creating reference maps on days where there are no runway 4R and 4L arrivals, to establish a definitive baseline noise level?

Let’s watch this project and see if it offers a smart and economical work-around, so we can move beyond the ongoing data obstruction by FAA and airport authorities.

Boston noise activist groups:

The Third Head of the NextGen Hydra: How FAA is Jamming Arrivals Closer Together

Three months ago, the ‘Dissecting NextGen’ presentation was made in Des Moines, to help people better understand the impacts of NextGen around Sea-Tac International Airport [KSEA]. Included within that presentation was discussion of ‘Hub Concentration’ and ‘Route Concentration’, as two of the main changes that are causing NextGen impacts. Well, continued research in the past months has revealed a third head to this monster: efforts by FAA to alter rules, to reduce spacing between arrivals, even setting up side-by-side arrivals to closely-spaced parallel runways.

FAA is using two main strategies to reduce arrival spacing:

  • Wake Recat: short for ‘wake recategorization’, this is the reduction of minimum safe distances behind larger aircraft that create wakes. Without getting into too much detail, a series of fatal accidents decades ago forced FAA to impose longer distances between successive flights on the same route, called ‘wake turbulence separation’. But, in time, with pressure to remove capacity limitations, the rules are being modified to shorter distances.
  • Simultaneous Dependent Approaches to Closely Spaced Parallel Runways (CSPR): many of the main hub airports rely on use of parallel runways that are spaced even less than half a mile apart. ATC can accommodate a lot of flights on/off parallel runways, primarily by using one runway to land and the other to takeoff. But, when weather deteriorates, especially if visibility is reduced or the ceiling (altitude of lowest cloud layer) gets to be too low, capacity plummets. So, FAA has been working with airlines to develop new ATC procedures that allow flights to be spaced much closer together when set up for landing on two or more parallel runways. [click here to view archived copies showing the evolution of FAA Order JO7110.308B since 2008]

What’s Bugging People?

Although most airports continue to be far below historic traffic levels, there are a dozen or so main hub airports where the ‘Final Four’ airlines (American, Delta, Southwest and United) schedule excessively. These are the airports where people are upset. They are seeing more flights, and they are seeing/hearing flights that are lower, often slower, seemingly louder (which is a given, for lower flights), and often turning closer to the airport than ever before. They are also seeing surges of flights — both departures and arrivals, in rapid succession, sometimes even side-by-side. It is scary to some, and deeply disturbing to many. Even retired air traffic controllers cannot believe what they are seeing. It is as if these few airports have acquired a meth or steroid addiction.

Authorities insist nothing has changed, but they are totally wrong. Well, not just wrong: they are lying, and they know it. At these few hub airports (Sea-Tac is the one growing the most in recent years, due to Delta’s 2012 decision to create a new hub), traffic volume is up, especially during the surges that happen in relation to expanded hubbing. But, there are also forces that are pushing arrivals closer to the ground. For example, with wake recat, the key thing to understand about aircraft wakes is they descend; i.e., the hazard that can flip a smaller airplane slowly drifts downward toward the ground, so ATC works hard to keep the trailing aircraft at least slightly above the leading aircraft. But, if ATC is trying to bring both aircraft in to land, on parallel runways, than ATC needs to push the lead aircraft down lower ASAP. Why? Because, if the lead aircraft is not descended low enough, the trailing aircraft will end up too high, unable to finish the approach. This results in a go-around, which carries higher risks and makes both flight crews and ATC do a lot more work.

An Example: A 13-hr Arrival Stream to Runways 4L & 4R at Boston

Boston offers an example of how badly communities are being impacted. Here, we have densely populated communities and a dominant regional airport, [KBOS], that effectively monopolizes commercial aviation.  Three airlines schedule excessively at KBOS: JetBlue, American, and Delta. JetBlue is the dominant hub airline with a schedule that generates a large number of through-passengers (thus imposing much larger impacts on the area, to accommodate the added flights).

To gain airline support for NextGen, or at least to ensure the airlines will not oppose NextGen (which would kill FAA’s chances of getting Congressional funding), FAA has sold out on their responsibilities to protect communities and the environment. FAA has apparently told the airlines that they can expect increased runway throughput, which FAA will achieve by abolishing all noise mitigation procedures and creating new flight procedures that turn lower and as close as possible to the runways. NextGen is being used as a decoy or cover; by claiming NextGen is all new and fancy, FAA tricks everyone – including Congress – into not noticing that what is REALLY happening is simply the wholesale abandonment of FAA’s past responsibilities to protect the environment and community health. And, by the way, NextGen is NOT all new and fancy; most of it has existed and been used for decades; the alleged benefits are just a fraudulent sales pitch.

Clearly, when you study what FAA has imposed at ALL NextGen airports, the game plan is to maximize runway throughput. This accommodates the ideal all airlines want: unrestricted scheduling to tweak profits higher using expanded hub operations. So, with this in mind, at an airport like Boston, FAA focuses on using the combination of runways with the highest capacity per hour, which at Boston is to have arrivals land on the parallel runways 4L and 4R. Just like happens when new freeway lanes are added, the airlines are quick to eat up the increased capacity; supply defines and expands demand. At Boston, FAA is now heavily relying on 4R and 4L to ‘accommodate’ the expansion by JetBlue, Delta and American. So much for quality of life under the intensified approach corridor. Milton does not really need to get sleep, do they???

A recent 13-hr arrival stream to Boston’s 4L and 4R

And, of course, FAA applies the same strategy at all airports where airlines want to expand hub-related profits: they use runway combinations that maximize capacity, even if wind and other factors might argue against these decisions. It’s called ‘choosing runways to traffic’, and it’s a way to be overly accommodative to airlines.

The result is streaming arrivals: nearly nonstop impacts on the ground, one arrival after another after another, sometimes even paired arrivals that are nearly side-by-side. As shown in this table, summarizing arrivals per hour on the intensified approaches to Boston’s runway 4L and 4R, the impact is relentless. Note the busiest hours are non-stop, averaging as little as 1.2-minutes between flights. [click here to view the entire stream in a data table]

And, adding insult to injury, when people notice and ask what has changed, both FAA and the airport authority (Massport, in this example) play with them: they say nothing has changed.

How Do We Kill This Monster?

FAA is simply out of control. And, Congress is doing squat to correct this problem. We need leaders in Congress to:

  1. demand that FAA serve the people ahead of the corporations, and this requires an emphasis on both transparency and accountability;
  2. demand that FAA cease spending our money to propagandize for the industry; this regulatory capture has gone on far too long;
  3. pass legislation that strongly disincentivizes airline hubbing – one of the simplest changes would be to formulate a new set of fees and taxes, the heart of which should be a very steep aviation fuel tax;
  4. and, pass legislation that restores local control, so that local communities have a real voice, and can impose reasonable curfews and capacity limits, and can say ‘NO!’ to airport over-expansion.

NextGen: “A Virtual Highway, and the Traffic Never Stops”

A good opinion piece related to NextGen impacts (and ongoing FAA failures) near the Baltimore-Washington Airport [KBWI]. This airport serves as the hub for Southwest, in the DC area (NOTE: the two other major airports serving the DC area are Dulles [KIAD] and Reagan National [KDCA]; United hubs at KIAD, and American dominates at KDCA]. There is some misinformation in the Op/Ed, as happens in a world run by money and set on crafting and pitching propaganda, but they also make some great points.

Here is an archived copy, with aiREFORM footnotes added:

Click on the image below for a scrollable view; the PDF file may be downloaded.

URGENT – The SeaTac Hardstand Needs to Be Appealed by July 28th

If there is one matter that people around SeaTac Airport [KSEA] need to focus on right now, it is the urgent deadline, just over a week away, for filing an appeal at King County Superior Court. That appeal, if granted, would force review of POS’s recent SEPA ‘Determination of Non-Significance’, or ‘DNS’, for the so-called ‘Hardstand’ expansion project. What exactly is a DNS? In this case, the DNS is POS’s way of administratively declaring, “oh, we want to enable the airlines to park 6 more airplanes for handling their through-passengers, but this will not increase flights and will have no significant impacts.” Really!?! Hmmm … this determination seems to lack plausibility.

A Closer Look at the Environmental Review Process

The Port of Seattle (POS) has an environmental staff, and one of their duties is to maintain a webpage listing various projects for both NEPA (federal) and SEPA (state) environmental review. People need to understand how these processes flow, and how they are so strongly biased to enable airport over-expansion while creating an illusion that the general public was involved in the process. This Post takes a closer look at the state portion, SEPA.

So, how does the SEPA work in the State of Washington? Probably very much like what has evolved (or devolved??) for environmental review in most states. As has become a common strategy at major airports across the nation, a bunch of paperwork is created, and procedures are ‘checked off’. At the right point in time (usually, immediately after seeing that it looks like all boxes were checked), the airport authority can then simply do what they intended from the start: declare their ‘Determination of Non-Significance’, or ‘DNS’. So long as nobody finds time or money to file an appeal at the courts, it is ‘Game Over’. The airlines (served by the airport authorities) get more expansion, and more profit potential; the airport authority gets a fatter budget and more passenger fee revenues; the controllers see an increase in traffic and may finally nudge past a threshold to get a nice pay raise.

And what about the thousands more residents now awoken by night flights? Not a problem; they were determined by POS to be ‘Not Significant’. And if that seems inaccurate, well, just try to fix it!

In short, it’s a rigged system. No surprises there. So, what do we do about it? Demand the system be improved, and take action to fix what has been done wrong. We all need to get our community leaders to file appeals, before that looming deadline (July 28th).

Here’s a plausible sample letter or email, that defines the concerns we need to communicate to the City Manager and Council Members at Des Moines:

Example of letter for individual use: Request for appeal of POS’s ‘SeaTac Hardstand DNS’
The new ‘Hardstand’ capacity expansion proposal at SeaTac Airport, with all of its implications for increased aircraft support activity and toxic emissions, should be given the consideration of a full Environmental Impact Study (EIS). With all due respect, a determination of non-significance issued by the Port of Seattle does not inspire one with confidence, nor does it guarantee that this project will not further negatively impact the citizens living under and around the concentrated NextGen flight corridors.
Up to this point in time, the Port of Seattle and the FAA have been woefully lacking in following adequate procedures for public notification and transparency regarding airport expansion plans. Their preferred method of operation seems to be fast-tracking, in order to quickly implement changes while minimizing citizen opportunities for comment or input.  A full EIS performed by an impartial entity should be mandated before the Port of Seattle is allowed to proceed with any further expansion.
This airport is already overcrowded, and the schedule has been expanded too far. Please file the necessary appeal.

For reference, the table below lists archived copies of the key documents POS created; they hope to begin construction of the hardstand capacity expansion, later this year.

6/6/2017 SEPA DNS (3pg) [link] .. one odd puzzle about this DNS: it appears to cover only the so-called ‘hardstand holdroom’ building, but not the actual hardstand
6/6/2017 Checklist for SEPA DNS (22pg) [link]
6/21/2017 Comment Period Extension (1pg) [link]
7/7/2017 Final SEPA DNS (6pg) [link] .. declares 7/28 deadline to appeal for review, at King County Superior Court
7/18/2017 ADDENDUM to Final SEPA DNS (2pg) [link]

List of Amendments Submitted to House Rules Committee, for H.R. 2997

Noon on Monday was an important deadline, for the formal submission of amendments to the draft House legislation reauthorizing FAA. A flood of amendments were submitted, very many of them related to reigning in FAA’s abusive NextGen implementation. A list of 116 amendments, with summaries, was posted, and a PDF copy is archived here. One of the most important amendments was submitted by Representative Lynch (MA), calling for a National Academy of Medicine (NAM) “…expert consensus report that sets forth current scientific knowledge relating to the various health impacts of air traffic noise and pollution.” (this amendment was marked as #50, in the center column of the list).

(click on image to view source tweet)

Cindy Christiansen deserves much of the credit for this, as she has done a great job researching and focusing on a much-needed study. Below is an excerpt from her letter to Rep. Lynch, earlier this month (view archived copy here): she lays out the NextGen impacts that FAA and airport authorities continue to ignore, and not just at Boston but across the land:

“…over the last several years, the FAA has implemented NextGen technology that replaces radar navigation with satellite-based navigation systems (GPS). Now and because of the new technology, concentrated flight paths that vary by less than a few feet vertically and laterally, increased airline operations, decreased separation, and lower altitudes have created a public health crisis in communities across the country. The new navigation system was implemented without any investigation into the human capacity to withstand the concentrated and relentless aviation noise and exposure to pollution, but the evidence is there, in the peer-reviewed literature, that there are significant detrimental effects on population health that are associated with these changes. We need a National Academy of Medicine committee of experts to synthesize the evidence and to report their consensus….”

As a side note, this is one of the rare ‘studies’ that has a chance to be very quickly produced, and with meaningful positive impact. Too often, and for decades now, FAA et al have used ‘more study’ as a delay tactic, to perpetuate changes that serve airlines/industry while impacting residents. This study is quite different, and essentially will soon force FAA to acknowledge the compiled content of dozens of studies they continue to ignore. Clearly, a NAM consensus report makes good sense, and will help us to break out of this stuck cycle.

Another community up in arms against NextGen: Linthicum, MD


(click on image to view source tweet)

As is the pattern everywhere, FAA’s NextGen implementation throws away the balance that previously existed between airport expansion and local quality of life. Near Baltimore [KBWI], and with FAA’s help, airline profits trump sleep and health. Click here to view an archived copy of this news article.

(kudos to Elaine Miller, at PlaneSense4LI, for tweeting this link!)

UPDATE, 7/17/2017: — The FAA/NextGen impacts around KBWI were brought up during a radio call-in show with Governor Hogan, who said: “This thing was a terrible decision in my opinion by the FAA, without really getting the proper input from the state and local authorities….” Click here for the article, or here for the 4-minute audio.

The Polis Amendment: We Need Local Control of Our Airports!

This Post is about a legislative amendment that is set for review (and hopefully will be adopted?!?) this coming week. Your support is urgently needed, to help restore local authority so that local officials can manage impacts caused by their local airports. A link to help you easily contact your elected representative and encourage their support of HR 2997, is located near the end of this Post. Here’s the background….

The Problem…

We have a problem. A BIG PROBLEM! The system of government in this nation, which was designed to empower individuals and ensure we can work together to prosper and share great lives, has become coopted. Money now controls everything. Aviation offers a concise case study of how bad this has become:

  • the ‘money’ is in the airlines, the manufacturers, the airport authorities, and the industry lobbyists; they spend this money to gain support from FAA and elected officials, to manipulate rules and procedures for their own profits.
  • all of the above have a near-total bias toward expanding airport operations, and a near-total indifference to the impacts that are destroying even historic residential neighborhoods.
  • the environmental costs are not just an inconvenience; the repetitive noise and air pollutants, now being concentrated over new ‘noise ghettoes’ below, create sleep loss, asthma, stress, heart failure, and other serious/fatal medical conditions.
  • citizens who speak up are routinely beaten down; their concerns are diminished and ignored by all authorities; pro-aviation trolls launch attacks via social media; we are led to feel we are ‘against progress’, which is so false (…in fact, we can clearly have moderation and managed impacts that still allow all the real ‘progress’ that an airport can provide – without destroying health & quality of life).
  • when we, as impacted citizens, approach elected officials, we soon learn these so-called ‘representatives’ exist only to fund their next election campaign … and so, they are nearly ALWAYS beholden to industry players; i.e., they will act empathetic and say they are concerned, but their ACTIONS achieve no resolution of our problems. Furthermore, when we look closely at the current Congress, we see that important gatekeepers, such as the Rules Committee, appear to have heavily biased memberships (which, if abused, can be used to summarily dismiss all amendments that do not serve party objectives).
  • when we approach the mainstream media, we quickly see their enormous bias … always in favor of money, always happy to pass on misinformation.
  • when we approach the courts, they too dismiss our concerns.

Given all of this, we could just consider it a lost cause, but we really must guard against that. Instead, let’s pick our strategy carefully, and coordinate our efforts. We have to do this, especially for the next generation.

The Solution…

The very heart of the solution is LOCAL CONTROL. All airports – even O’Hare and Atlanta, the two busiest in the world – ultimately serve the local community. So, why in the world would we let FAA bureaucrats in DC take away the right – and responsibility(!) – of local officials to impose curfew hours, limit operations per hour, and impose other safe and reasonable policies that properly balance airport impacts with airline profit margins? Simply, we WOULD NOT DO THIS. This has happened, only because FAA is a captured regulator; FAA is only pretending to regulate the very industry it serves. And we are the victims, the collateral damages.

This is where the Polis Amendment comes in. Jared Polis, a Congressman representing citizens near the skydiving-noise impact-zone around the Longmont airport, has been working hard to assist those impacted. They have worked for years to get cooperation from Mile Hi, but profitable tandem jumps help the Mile Hi owner, Frank Casares, to refuse to cooperate. Local elected officials feel powerless and defer to FAA, but FAA does nothing… all they want to do is enable aviation commerce, with no regard for the ‘costs’ imposed on others. And so, the problems continue. (click here to view many other aiREFORM articles about Mile Hi and impacts around Longmont)

Here are two recent graphics about the Longmont impacts:

Notice how the climbs are routinely done a few miles AWAY from the actual airport. This helps keep airport neighbors from complaining; it also dumps noise pollution on distant neighbors, many of whom are unaware why they keep hearing so many planes. (click on image to view source tweet)

The shifting of skydiving climbs away from the airport is not only a dumping of noise pollution, it is also DANGEROUS: other pilots, flying through the area, will have a much harder time spotting the skydive aircraft when they are not within a couple miles of the target airport. (click on image to view source tweet)

The Polis Amendment seeks to add text to the FAA Reauthorization Bill (HR 2997), to explicitly restore Local Control of GA Airports (i.e., at General Aviation airports that primarily serve recreational pilots). HR 2997 is also known as the ’21st Century Aviation Innovation, Reform, and Reauthorization Act’, or AIRR, and is being pushed by Bill Shuster, along with lobbyist A4A, the airlines, and officials like Transportation Secretary Elaine Chao. The ‘Reform’ part is a cruel joke; these reforms will only further empower corporate greed, while disempowering us individual citizens. The bill is working its way up to a final vote by the House. The process this week includes getting the amendment approved by the Rules Committee (probably in a meeting on Monday), then proceeding to discussion (probably Wednesday) and eventually for final debate on the House floor.

Here is a copy of the text, proposed for addition at the end of Title VI (Miscellaneous):

So, people who can see […and hear, and BREATHE(!) the impacts of unmitigated aviation…] all need to be heard this week. Contact your elected representative, and let them know why they need to support the Polis Amendment, why WE NEED to restore local control of our LOCAL airports.

This is the first step. Eventually, local control also needs to include empowering the hundreds of thousands of residents impacted under concentrated NextGen routes, to have a real voice – and the democratic authority – to impose curfews, hourly operations limits and other capacity management restrictions that best serve the local community. Every great journey starts with a single step, and local control at GA airports needs support even from those of us who live in the new noise ghettoes FAA is creating, via NextGen.

Take Action, Please!

Please contact your elected representative. Here’s a handy link to identify your rep:

For further information, please see this petition at This is an excellent petition, laying out the goals for resolving all sorts of aviation impacts across the nation. The petition proposes the following seven elements for the 2017 FAA Reauthorization, now being considered by Congress:

  1. Update noise metrics used to evaluate significant exposure.
  2. Require environmental impact reviews prior to flight path changes.
  3. Mandate a robust and transparent community engagement process, including pre-decisional public hearings, for any new or modified flight paths or “flight boxes.”
  4. Restore local control over airport operations.
  5. Remove the FAA from oversight of environmental quality and public health.
  6. Mandate robust data collection and analysis of aviation noise and other pollutants near airports.
  7. Ban flights over and within 2 miles of designated noise sensitive areas.

KSEA North Flow Arrivals: How Federal Way Residential Communities are Impacted

Here’s an example flight, showing how FAA/ATC chooses to accommodate airline profits ahead of citizen impacts. In this case, ATC controls a North Flow arrival from Alaska, to land on Runway 34L at SeaTac [KSEA]:

Assorted online images showing the arrival satview and data for Alaska Flight 914, Anchorage-Seattle, landing at 11:22AM on Friday, 7/14/2017. Notice how, as the arrival approached the south end of Vashon Island, ATC issued a left turn, which created low-altitude noise impacts on the north shore area of Federal Way / Dash Point. Notice also, the incredibly straight route for most of the flight; this shows, the ‘direct route’ efficiencies proclaimed as a key NextGen selling point in fact already exist! (source: FlightAware)

And, here’s a VFR sectional (aviation chart) that enables us to precisely identify distances ‘on final’, from the approach end of the runway at KSEA:

A screencap showing the ASA914 route superimposed on a VFR sectional. Note the gridlines on the VFR sectional; the tick-marks on the vertical gridlines are one statute mile apart. Red lines and tags have been added to this image, marking 5-mile, 10-mile, and 15-mile distances on a final to land Runway 34L. Contrary to Port of Seattle claims in the past, Runway 34L has become the primary landing runway at SeaTac, when in North Flow. (source: FlightAware)

The Problem:

Air traffic controllers (ATCs) generally do not factor environmental impacts into their control decisions. So, if an arrival lined up on the NextGen RNAV route over Vashon Island sees the airport on a clear day, if other traffic allows, ATC will be inclined to turn that arrival early, to line up onto a short final. In this example, that early turn happened because ATC saw enough space to safely issue the early turn, ahead of the next arrival. This arrival turned final near 279th. The consequences include an adverse impact upon thousands of homes, because early turns need to be much lower, to make the descent to the landing runway.

The Solution:

ATC needs to fully incorporate community concerns into their standard operating procedures.

For noise mitigation, and to protect residential communities, turns should be conducted no closer than to a 10-mile final. In this example, a turn to a 10-mile final (near Wild Waves) would occur over industrial/commercial properties at the Port of Tacoma, thus would potentially impact thousands fewer homes.

To the left, see an example of a later flight that was kept higher and, turned onto final at a distance of approximately 14-miles: Xiamen Air Flight #845, a Boeing 788, from Shenzhen, China (near Hong Kong).