AT-504: Learn and earn. With side-by-side cockpit seating and 485-gallon capacity, the AT-504 is a great way to train new ag pilots and earn while they learn. Powered by the Pratt & Whitney PT6A-34AG turbine engine, you’ll get working speeds and performance like the tried and true AT-502B. And when the training day is done, you’ll see that it was productive workday, too. Wells Fargo financing for qualified buyers is available; just visit with your Air Tractor dealer.