Live coverage: SpaceX supply ship returns to Earth

SpaceX aborted a launch attempt Thursday just three seconds before liftoff at the start of the engine ignition sequence, delaying the flight of a Falcon 9 rocket from California with 10 satellites for the U.S. military’s Space Development Agency.

A Boeing-built communications satellite lifted off at 7:21 p.m. EDT (2321 GMT) Monday on top of a SpaceX Falcon 9 rocket from NASA’s Kennedy Space Center in Florida. The spacecraft will add to Inmarsat’s Global Xpress network linking airplanes, ships and other mobile terminals with broadband Internet and data services.

SpaceX scrubbed an attempt to launch a commercial Falcon 9 rocket Sunday less than a minute before liftoff, blaming a sensor issue on the vehicle’s first stage and pushing back the company’s first national security mission for the U.S. government at least 24 hours.