Related Clues:

• Useful info at Dulles
• Viscosity symbols
• Seventh Greek letter
• Airport guesstimate
• Pilot's info, briefly
• Platonic letter
• Letter from the Corinthians
• Zeta's follower
• Theta follower
• In-flight guesstimate, for short
• Flight data, briefly
• Sched. abbr.
• Theta's preceder
• H lookalike
• Flight guess: Abbr.