The Boeing KC-135 Stratotanker is a four-engine jet tanker-transport derived from the 367-80 prototype that also led to the 707. First flown in 1956, it became the backbone of U.S. aerial refueling while retaining airlift, aeromedical, command-post, observation, and test derivatives; successive re-engining programs have kept the type in active service for decades.
Alerts for directly linked future launches and major activity.