A Boeing 767 (United Flight 28) was airborne for nearly five hours over the English Channel, while burning off and dumping fuel to return for a landing at London’s Heathrow airport. The airline is not explaining yet what the issue was, but the flight tracking data indicates the flight diverted to the south after departure, then leveled off first at ten thousand feet, then at twelve thousand feet. It appears to have flown nineteen loops, mostly using up fifteen minutes per loop, and to the southwest of the Isle of Wight.
The low altitudes would suggest their was an aircraft pressurization issue. A passenger reported to the media that the captain had advised they needed to get rid of 20,000 pounds of fuel before they could return to land.
The incident was well covered in an article at DailyMail.com. One comment stands out:
A good point. It seems plausible that, for aviation mechanical events such as this, airline transparency would be the best course. The current practice of opacity only causes people to wonder, what is the airline trying to hide. And certainly, the 227 passengers on board have a right to know what happened, on the flight they paid for.