the priciest space missions in history. The two aircraft were Boeing 747s altered to transport enormous spacecraft through the sky.
Though the space shuttle resembles an airplane, its flight mechanics are different. They do not possess the turbofan engines characteristic of commercial airliners and serve essentially as conveyances for passengers and freight, utilizing rocket engines for ascent and then gliding down for landing. Thus, the 747 was utilized as the shuttle’s transport between takeoff and landing locations.
In selecting an aircraft for this role, NASA focused on the Lockheed C-5 Galaxy and the Boeing 747. Ultimately, NASA opted for the 747 for two primary reasons. Firstly, its wing design was more favorable for supporting an orbiter. Secondly, the C-5 Galaxy is a military aircraft, meaning NASA would have needed to obtain it from the Air Force. Instead, the agency could easily purchase 747s and possess full ownership, a decision that became more economical due to an economic recession in the 1970s.