The air tanker is a fixed wing aircraft with the ability to carry and discharge fire retardant on demand.
Aircraft range from single propeller to jet engine. The system varies in the amount it can carry and how it discharges material. Many types of air tanker exist. For example – Air Tractor AT-802 is an agriculture air craft that may be adapted for firefighting. These aircraft can carry a payload of 820 US gallons (3100 L).
By contrast, the Evergreen 747 Supertanker has a massive payload of 20,500 US gallons (77,600 L).