Possible Clues:

• LAX tower gp.
• Flight overseers (abbr.)
• Takeoff and landing overseers (Abbr.)
• Flight coordinators in a union busted by Reagan: Abbr
• LAX tower worker: Abbr
• Org. that pilots pilots
• JFK tower worker
• J.F.K. tower grp
• Gp. that keeps planes from hitting each other
• Grp. that pilots pilots