Wouldn't then every aerospace company in the US be built on the back of tons of government investments in space, science and engineering? They everyone aerospace company exists on government handouts?
As far as Commercial Crew and Cargo. The US government didn't pay for the full development which is one of the reasons why the US government didn't claim full ownership. If the US government claims full ownership they then assume responsibility for the vehicle and support of that vehicle government forward. A good example of that would be the SLS program which the US government assumes full ownership of the vehicle and all support costs including production line costs. With the resulting in tens of billions of costs for NASA. In your commercial airline example. In a way airlines do pay for development costs by signing a contract for a purchase commitment of a certain number of airframes. Getting enough purchase commitments is a way that a aerospace company judges interest for new airframe development. With space right now, we have to remember that the US government is the largest purchaser of space services for the industry because the industry is developing. For Space the US government is trying to develop the industry so they are just one of many customers and if they want services all they have to do is buy a ticket.
Umm it's absolutely no question that Boeing, Lockheed, and NGC exist on the back of government spending. Most of the major engine breakthroughs have also been on the backs of direct government investment.
Of course airlines indirectly pay for the development of an aircraft, and sometimes they directly pay for certain modifications. But Southwest doesn't directly give Boeing $10B to develop a new 737.
But there is nothing wrong with this. I fully support government funding science and innovation. Without the government there would basically be no space technology. My issue is when companies benefit massively from government spending and investment, then once they make it they all of a sudden become very libertarian.
I do also think the firm fixed price structure of commercial crew produces much better results than cost plus fixed fee of SLS. SLS was obviously nothing but a government bailout from day one.
Tesla also exists as it does today through direct government subsidization.