The Airbus A330 Multi Role Tanker Transport (MRTT) is a European aerial refuelling and military transport aircraft based on the civilian Airbus A330. A total of 16 countries have placed firm orders for approximately 68 aircraft, of which 51 had been delivered by 30 November 2020. A version of the A330 MRTT, the EADS/Northrop Grumman KC-45, was selected by the United States Air Force for its aerial tanker replacement programme, but the programme was cancelled.

A military transport aircraft, military cargo aircraft or airlifter is a military-owned transport aircraft used to support military operations by airlifting troops and military equipment. Transport aircraft are crucial to maintaining supply lines to forward bases that are difficult to reach by ground or waterborne access, and can be used for both strategic and tactical missions. They are also often used for civilian emergency relief missions by transporting humanitarian aid.