Related Clues:

• Useful info at Dulles
• Seventh Greek letter
• Cross-shaped character
• Airport guesstimate
• Pilot's info, briefly
• Platonic letter
• Letter from the Corinthians
• Zeta's follower
• Theta follower
• In-flight guesstimate, for short
• Letter on some college sweatshirts
• Sched. abbr.
• Follower of sigma
• Theta's preceder
• H lookalike