(AP) — Last-minute rocket trouble forced SpaceX on Saturday to delay its inaugural launch from NASA's historic moon pad. Thousands of guests had jammed the space center to witness the comeback of 39A, last used in 2011 for the last space shuttle flight. "Standing down to take a closer look at positioning of the second stage engine nozzle," SpaceX said later via Twitter. SpaceX turned to Launch Complex 39A — which it leases from NASA — to resume flights.