The Boeing KC-135, nicknamed Stratotanker is an aerial refueling aircraft that has been in continuous service with the USAF for over 60 years with over 800 examples of the C-135 series built.

The U.S. Air Force Air Mobility Command has suggested their KC-135 Stratotanker fleet may serve beyond 2050 with a life extension and upgrade program. Almost 70 years after the type's first flight, ...