Related Clues:

• Hack
• It has a bill of fare
• Gypsy ___
• Picker-upper
• Public transport
• Cry that stops traffic
• See 32-Down
• 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