Aviation
- Aircraft Type rating, an addition to a pilot's license which allows the pilot to serve as pilot-in-command of a particular aircraft type in commercial operations
- ATR (aircraft manufacturer) an Italian-French aircraft manufacturer
- ATR 42 twin-turboprop, short-haul regional airliner, 40-50 passengers, maiden flight 1984, over 400 delivered
- ATR 72 twin-turboprop, short-haul regional airliner, seats up to 74, maiden flight 1988, over 400 delivered
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