Related Clues:

• Barrier
• Flight plan ref.
• Getting-in guess
• Itinerary letters
• Elasticity symbol, in economics
• Capt.'s announcement
• Touchdown abbr.
• Travel sched. notation
• Capt.'s estimate
• Flight-board abbr.
• Sched. number
• Boarding pass datum
• Fence door
• H, in a fraternity
• Socratic vowel