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The X-37B presently in orbit this weekend set a record for the longest in-orbit flight for the Air Force’s fleet of two ships.
As of today (March 25), the X-37B has spent 675 days on its latest Earth-circling mission, which is known as Orbital Test Vehicle-4 (OTV-4). The previous record was 674 days, set during OTV-3, which lasted from December 2012 to October 2014. It’s unclear what the new duration record will end up being; most X-37B activities and payloads are classified, and the Air Force has historically been tight-lipped about landing plans.