UPDATE (April 23, 2010): The X-37B was successfully launched at 19:52 EDT (23:52 GMT) yesterday, April 22.
ORIGINAL STORY (April 21, 2010): The Air Force’s experimental X-37B spaceplane is on the pad at Cape Canaveral, FL ready for launch tomorrow evening on an Atlas 5, according to Spaceflightnow.com. Some call it a spaceplane, some call it a mini-shuttle, and its classified mission adds an air of suspense and mystery.