Related Clues:
- Vehicles first to come with special braking system
- Vehicles about to be supplied with special braking system
- Semi parts
- Train station waiters
- Autos with meters
- Caught by sailors - to get back to their ships?
- Those of rank, perhaps, developing basic duty first
- Some airport arrivals
- Taxies
- They get hailed
- They're all around JFK
- Tourist transports
- Vehicles heading for the runway?
- Vehicles found in five other Across answers in this puzzle
- Napa options, informally