SpaceX’s next Falcon 9 rocket arrived at Kennedy Space Center’s pad 39A on Thursday for a hold-down engine firing ahead of launch next week with the U.S. Air Force’s X-37B spaceplane. The brief engine ignition occurred at 4:30 p.m. EDT (2030 GMT).

The issue with a gaseous nitrogen pipeline that caused the late March launch scrub was able to be resolved, according to NASA and its contractor, Air Liquide. Liftoff from Space Launch Complex 37 occurred at 12:53 p.m. EDT (1653 UTC).

A United Launch Alliance Atlas 5 rocket blasted off from Cape Canaveral at 8:38 a.m. EST (1338 GMT) Friday to place the Global Positioning System 2F-12 navigation satellite into space. Follow the mission in our live journal.