Blue Origin believes it can manufacture the engine at 25 percent of the cost of a BE-4 engine and eventually reach the point where each engine can be assembled in less than a day. The company is deep into development and testing of Northstar, having already begun a test-firing campaign.

Firefly Aerospace has signed a $1.3 billion deal to supply 36 rocket engines to AST SpaceMobile for its new heavy-lift rocket. The Cedar Park aerospace and defense startup will provide 27 Miranda engines and nine Vira engines for AST SpaceMobile's first three rockets.