The KC-135 Stratotanker is a military aerial refueling aircraft developed by Boeing. It was first introduced in the 1950s and has been a vital part of the United States Air Force's operations. The aircraft can refuel various types of military planes in mid-air, extending their range and operational capabilities. Equipped with a boom system and hose-and-drogue method, the KC-135 can transfer fuel to multiple aircraft simultaneously. Its design is based on the Boeing 707 commercial airliner, allowing for efficient flight and maintenance. The KC-135 remains in service today, supporting missions around the world.