Related Clues:

• Airport data
• Conductors' concerns
• Pilots' announcements, briefly
• Some flight data
• Airport data, for short
• Homeric H's
• Letters from Greece?
• Dispatcher's concerns
• Sched. guesses
• Airport guesses, briefly
• Airport tower data
• H-like letters
• Schedule stats
• Itinerary nos.
• 45-Across info