No air force in the world is remotely close to being able to project power far and wide like the United States Air Force ( except for the US Navy/Marines air forces as they operate the world’s greatest fleet of aircraft carriers). To be able to project air power a meaningful distance from one’s own airspace, an air force must have aerial tankers and/or the use of foreign air bases (or aircraft carriers). According to FlightGlobal, the US Air Force possesses 75% of the world’s aerial tanker fleet, meaning when it comes to in-air refueling, there’s the US and the rest.