Details: This poster shows a a KC-135 Stratotanker refueling a US Air Force plane mid-air. Below the planes is a dotting of clouds.
The Boeing KC-135 Stratotanker is an aerial refueling tanker aircraft, first manufactured in 1956 and expected to remain in service into the 2040s. Aerial refueling, also called in-flight refueling (IFR) or air-to-air refueling (AAR), is the practice of transferring fuel from one aircraft to another during flight. This allows the receiving aircraft to remain airborne longer, and enables a takeoff with a greater payload.