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SpaceX and Stratolaunch have parted ways.
In the original plan, Stratolaunch would build the first stage, the biggest airplane every built, which would lift the second stage, SpaceX’s Falcon 9, into the air. It appears, however, that the modifications required to make the Falcon 9 work in this configuration were not in SpaceX’s interest, so the company backed out and Stratolaunch has instead made a deal with Orbital Sciences to provide the second stage rocket.