Full FAA Chronology at this link.
19660425: FAA established the National Airspace System Program Office, replacing the NAS Special Projects Office as a staff element under the Associate Administrator for Development. Headed by the Deputy Associate Administrator for Development, NASPO had responsibility for design, engineering, procurement, and installation–in addition to central programming, planning, and scheduling — of designated program elements of the air traffic control subsystem of the National Airspace System. (See May 18, 1970 and February 10, 1972.)
19690425: More than 800 aviation community representatives attended the first National Aviation System Planning Review Conference, held in Washington, D.C.