SpaceX was originally going to build a 4-engine Falcon for Stratolaunch, which is building a huge carrier aircraft, but later decided it was a distraction. htt

SpaceX was originally going to build a 4-engine Falcon for Stratolaunch, which is building a huge carrier aircraft, but later decided it was a distraction. https://en.wikipedia.org/wiki/Stratolaunch_Systems https://en.wikipedia.org/wiki/Stratolaunch_Systems https://en.wikipedia.org/wiki/Falcon_9_Air https://en.wikipedia.org/wiki/Falcon_9_Air Stratolaunch's latest strategy is to use Pegasus XL to launch from their plane, as many as three in a single flight. While they had flirted with a rocket that had one cryo stage, Pegasus XL and the other rocket that OrbitalATK might build for them are both all-solids.