Aerojet, the company that reworks the old engines before sending them to Orbital, purchased 36 engines. That's enough for 18 Antares rockets. That will cover th

Aerojet, the company that reworks the old engines before sending them to Orbital, purchased 36 engines. That's enough for 18 Antares rockets. That will cover the current CRS contract and maybe a follow-up or some commercial satellite launches. Beyond that Aerojet has a license to manufacture US-made copies of the engines. That isn't as easy as following a recipe, but it is something they are working on.