This is the 12th planned flight of the Orbital ATK's uncrewed resupply spacecraft Cygnus and its 11th flight to the International Space Station under the Commercial Resupply Services contract with NASA. Northrop Grumman named the vehicle after Apollo 1 astronaut Roger Chaffee.
Antares known during early development as Taurus II, is an expendable launch system developed by Orbital Sciences Corporation (now part of Northrop Grumman Innovation Systems after Northrop Grumman acquired Orbital ATK) and the Yuzhnoye Design Bureau to launch the Cygnus spacecraft to the International Space Station as part of NASA's COTS and CRS programs. Able to launch payloads heavier than 5,000 kg (11,000 lb) into low-Earth orbit, Antares is the largest rocket operated by Orbital ATK. Antares launches from the Mid-Atlantic Regional Spaceport and made its inaugural flight on April 21, 2013.See Antares Details
Cygnus NG-11, previously known as CRS OA-11, is the twelfth planned flight of the Northrop Grumman robotic resupply spacecraft Cygnus and its eleventh flight to the International Space Station under the Commercial Resupply Services contract with NASA. The mission is scheduled to launch on 17 April 2019. This is the last mission from the extended CRS contract; followup missions are part of the CRS2 contract.Cygnus Enhanced Details
Northrup Grumman Space Systems designs, builds and delivers space, defence and aviation-related systems to customers around the world. They aquired Orbital ATK in 2018 along with its launchers and ongoing missions.INFO WIKI