Inmarsat-5 F4 Mission Mission Overview SpaceX’s Falcon 9 rocket will deliver Inmarsat-5 F4, a commercial communications satellite, to a Geostationary Transfer Orbit (GTO). As the industry leader and pioneer of mobile satellite communications, Inmarsat has been powering global connectivity for more than three decades. SpaceX is targeting launch of Inmarsat-5 F4 from historic Launch Complex 39A (LC-39A) at NASA’s Kennedy Space Center in Florida. The 49-minute launch window opens on Monday, May 15, at 7:21 p.m. EDT, or 23:21 UTC. A backup launch window opens on Tuesday, May 16, at 7:21 p.m. EDT, or 23:21 UTC. SpaceX will not attempt to land Falcon 9’s first stage after launch due to mission requirements.