United States Air Force Thunderbirds
In 1968, the C-54 Skymaster transport aircraft was replaced with a Lockheed VC-121J Constellation. The Blues transitioned to the two-seat McDonnell Douglas F-4J Phantom II in 1969, nearly always keeping the back seat empty for flight demonstrations. The Phantom was the only plane to be flown by both the "Blues" and the United States Air Force Thunderbirds (the "Birds"). That year they also upgraded to the Lockheed C-121 Super Constellation for logistics.