The Air Tractor AT-504 is a spray plane and trainer that's an excellent platform for aerial application instruction. Side-by-side cockpit seating lets experienced pilots effectively train new turboprop pilots. Both instructor and trainee each have complete flight controls and virtually the same cockpit view and flight perspective.Equipped with a Pratt & Whitney PT6-34AG engine, the AT-504 has working speeds equal to the AT-502B. Payload capacity is 485 gallons. Novice turboprop pilots experience similar flight performance when they move from the AT-504 to the AT-502B or other similar size turboprop ag planes.