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Falcon 9 is a SpaceX rocket, not a ULA rocket. Yes, I'm aware of that. There are advantages and disadvantages to both approaches. ULA has a long track record

by ansible 12y ago

Falcon 9 is a SpaceX rocket, not a ULA rocket. Yes, I'm aware of that. There are advantages and disadvantages to both approaches. ULA has a long track record of going to space very reliably on single engine platforms. That's true. Both the Atlas and Delta programs have been pretty reliable.