Related Clues:

• Greek H
• In-flight P.A. announcement
• A mail carrier has one: Abbr.
• LAX guesstimate
• Postal abbr.
• Guesstimate letters
• Capt.'s prediction
• Traveler's info
• Efficiency symbol, in physics
• 66, e.g.: Abbr.
• Sched. letters
• Itinerary abbr.
• Certain fraternity chapter
• KLM announcement
• Terminal letters