How many aircraft does the kc-135 refuel?

The KC-135 has been in service to the U.S. Air Force since June of 1957, and since then has refueled nearly every aircraft the the inventory from that time onward.

KC-135s typically refuel using what is known as an Air Refueling Boom, which is a flyable, arm-like device attached to the rear of the aircraft. The KC-135 is also capable of being outfitted with one and/or two Probe-and-Droge-type refueling devices. These are the MPRS (Multi-Point Refueling System) Pods, and the Probe-and-Drouge Adapter.

This flexibility in function allows the KC-135 to refuel both Boom-type receivers, which are standard to the U.S. Air Force inventory, and Drogue-type receivers, which are typical of the U.S. Naval inventory.

The only commonly used, fixed-wing military aircraft that cannot be refueled by the KC-135 are basic models of the C-130, the U-2, and all UAVs (such as the MQ-9 "Reaper" and RQ-4 "Global Hawk").