First, to certify a new aircraft takes 5-9 years (source below). https://www.faa.gov/aircraft/air_cert/airworthiness_certification https://www.faa.gov/aircraft

First, to certify a new aircraft takes 5-9 years (source below). https://www.faa.gov/aircraft/air_cert/airworthiness_certification https://www.faa.gov/aircraft/air_cert/airworthiness_certific... Lets say they are really good and they are ready to test fly in 3 years to meet that 5 year goal (which I'll tell you right now is not happening), they still need engines. 3 years to design, develop, and build a clean sheet engine. It took GE and Safran (CFM) 10 years between the announcement of the LEAP and its certification: https://en.wikipedia.org/wiki/CFM_International_LEAP https://en.wikipedia.org/wiki/CFM_International_LEAP So no, it is quite unlikely that a company with no experience in commercial jet engines (Florida Turbines, subsidiary of Kratos) will be able to field the equivalent of a modern day concord engine in 3 years. I would say the main reason people think it could be is successful PR from new startups.