Related Clues:

• Secure for a flight
• It has a bill of fare
• Picker-upper
• Cry that stops traffic
• It has a prominent horn
• Medallion site
• Prepare to fly
• Sight at a station
• Airport waiter?
• Checker, perhaps
• Subway alternative
• It has a horn and charges
• El alternative
• Hack's vehicle
• Loosen, in a way