Aerial refueling, also referred to as air refueling, in-flight refueling (IFR), air-to-air refueling (AAR), and tanking, is the process of transferring aviation fuel from one military aircraft (the tanker) to another (the receiver) during flight. The two main refueling systems are probe-and-drogue, which is simpler to adapt to existing aircraft, and the flying boom, which offers faster fuel transfer, but requires a dedicated boom operator station.

The procedure allows the receiving aircraft to remain airborne longer, extending its range or loiter time. A series of air refuelings can give range limited only by crew fatigue and engineering factors such as engine oil consumption. As the receiver aircraft can be topped up with extra fuel in the air, air refueling can allow a takeoff with a greater payload which could be weapons, cargo, or personnel: the maximum takeoff weight is maintained by carrying less fuel and topping up once airborne. Aerial refueling has also been considered as a means to reduce fuel consumption on long-distance flights greater than 3,000 nautical miles (5,600 km; 3,500 mi). Potential fuel savings in the range of 3540% have been estimated for long-haul flights (including the fuel used during the tanker missions).Usually, the aircraft providing the fuel is specially designed for the task, although refueling pods can be fitted to existing aircraft designs if the "probe-and-drogue" system is to be used. The cost of the refueling equipment on both tanker and receiver aircraft and the specialized aircraft handling of the aircraft to be refueled (very close "line astern" formation flying) has resulted in the activity only being used in military operations. There are no regular civilian in-flight refueling activities. Originally employed shortly before World War II on a very limited scale to extend the range of British civilian transatlantic flying boats, and then after World War II on a large scale to extend the range of strategic bombers, aerial refueling since the Vietnam War has been extensively used in large-scale military operations.



Lowell Herbert Smith (October 8, 1892 – November 4, 1945) was a pioneer American airman who piloted the first airplane to receive a complete mid-air refueling (along with Lt. John P. Richter) on June 27, 1923, and later set an endurance record of 37 hours on August 28, both in a De Havilland DH-4B. Smith also piloted the Douglas World Cruiser Chicago, which along with one other made the first aerial circumnavigation in 1924. Smith held 16 records for military aircraft in speed, endurance and distance. He was awarded the best achievement in flight Mackay Trophy twice.