Space Shuttle Carrier loading the Enterprise

Shuttle Enterprise being loaded onto the Shuttle Carrier Aircraft.

Space Shuttle Enterprise being lifted onto the Shuttle Carrier Aircraft.

Mating required a purpose-built gantry called the mate-demate device - the orbiter was hoisted, the 747 towed underneath, and the orbiter lowered onto its struts. Enterprise never flew in space; it was used for approach and landing tests, released from the SCA in flight.