SpaceX signs first customer for used Falcon rocket

By Irene Klotz CAPE CANAVERAL, Fla. (Reuters) - Elon Musk's SpaceX has signed its first customer to use a previously flown rocket, with launch planned for later this year, the companies said on Tuesday. The launch for Luxembourg-based satellite operator SES SA will mark the first commercial reuse of a Falcon 9 rocket, which is crucial to efforts by technology entrepreneur Musk's Space Exploration Technologies Corp to reduce the cost of space launches. SpaceX President Gwynne Shotwell previously