Possible Clues:

• Flight coordinators: Abbr
• LAX tower service
• Flight coordinators: Abbr.
• Plane watcher: Abbr.
• ORD tower gp
• PDX tower group
• FAA employee
• Grp. that coordinates E.T.A. and E.T.D
• Flight watcher: abbr.
• Takeoff and landing overseers: Abbr.