Aerial refueling (en-us), or aerial refuelling (en-gb), also referred to as air refueling, in-flight refueling, air-to-air refueling, and tanking, is the process of transferring aviation fuel from one aircraft (the tanker) to another (the receiver) while both aircraft are in flight.

An onboard refueling vapor recovery system is a vehicle fuel vapor emission control system that captures volatile organic compounds (VOC, potentially harmful vapors) during refueling.

In the United States Navy, Refueling and Overhaul refers to a lengthy refitting process or procedure performed on nuclear-powered naval ships, which involves replacement of expended nuclear fuel with new fuel and a general maintenance fix-up, renovation, and often modernization of the entire ship.

Omega Aerial Refueling Services Incorporated is an American aviation company that provides aerial refueling services for military customers.