Air Force’s X-37B Space Plane Mystery Mission Wings by 500 Days in Orbit Prison Planet.com Posted on October 11, 2016 Posted in Aggregated No Comments Tagged with Sci Tech Space.com | The latest secretive mission of the United States Air Force’s X-37B space plane has cruised beyond 500 days in Earth orbit since its launch last year. Share this:Share Share on Facebook (Opens in new window) Facebook Share on Reddit (Opens in new window) Reddit Share on X (Opens in new window) X Share on LinkedIn (Opens in new window) LinkedIn Email a link to a friend (Opens in new window) Email