EnterpriseSpace Shuttle Enterprise makes its fourth free-flight after separating from its modified Boeing 747 carrier aircraft, gliding to a safe landing at Edwards Air Force Base’s dry lake bed runway. For the first time, Enterprise’s engines are left exposed, adding to the drag experienced by the gliding shuttle rather than masking the engines with a protective cover. This more accurately simulates the aerodynamics of a shuttle returning from space. Enterprise’s crew for the two-and-a-half-minute flight consists of Joe Engle and Richard Truly.