"There have been five X-37 orbital missions. The spaceplane's first mission, USA-212, was launched in April 2010 and returned to Earth in December 2010. A second X-37 was launched on mission USA-226 in March 2011 and returned in June 2012. The third mission was USA-240, which launched in December 2012 and landed in October 2014. The fourth mission, USA-261, launched in May 2015 and landed in May 2017. The fifth and latest X-37 mission, USA-277, was launched on 7 September 2017, and broke the record for the longest X-37 mission, after 718 days in orbit, on 27 August 2019, finally landing on 27 October 2019 after 780 days in orbit."

https://en.wikipedia.org/wiki/Boeing_X-37