4. Air Tractor AT-802A
This is the largest single-engine agricultural aircraft. It has a payload o 9249lbs. It has an 800-gallon hopper. No other single-engine ag aircraft offers more working capacity..It can be deployed for agricultural or special mission operations like fire services and military.it is powered by Pratt and Whitney PT6A-65AG. This is the fourth best-selling aircraft in 2021.