Posted: Sat, Apr 11, 2015, 11:04 AM ET (1504 GMT)
The launch of a classified Air Force spaceplane on its fourth mission has been postponed at least two weeks, officials said Friday. The launch of an Atlas 5 from Cape Canaveral on a mission designated AFSPC-5 has been delayed from May 6 to no earlier than May 20. The delay is "to accommodate a spacecraft issue," United Launch Alliance said in a statement, but provided no additional information. No details about the mission have been officially released by the Air Force, but the launch will carry the X-37B spaceplane on its fourth mission. On the previous X-37B mission, the spacecraft stayed in orbit for nearly 675 days before landing in California. The Air Force has not disclosed what missions the X-37B carries out in orbit.

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