Related Clues:

• Airport postings
• In-flight announcements
• GPS calculations
• Greek letters in geometry class
• Detectives for hire, for short
• Landing predictions
• "H" look-alikes
• Touchdown predictions
• Airport data
• Letters above some stoas on campus
• Conductors' concerns
• Pilots' announcements, briefly
• Some Greek sisters
• Some flight data
• Airport data, for short