Related Clues:

• Electrical resistance symbols
• N N N
• Homeric H's
• Letters from Greece?
• Dispatcher's concerns
• Sched. guesses
• Letters resembling tridents
• Letters before xis
• Latitude indicators
• Airport guesses, briefly
• Airport tower data
• H-like letters
• Greek alphabet enders
• P-like Greek letters
• Itinerary nos.