{deleted} - largely due to me misreading "mid 2020s" as "mid 2020" for delivery of new planes and being highly skeptical of the ability to go from 0 to airliner in 5-6 years.
SpaceX spent less than 100mm year until 2012, and delivered something that cost others billions to create. As mentioned elsewhere, there is a lot of inertia in older/larger corporations.
Um... what? The Falcon 1 and 9 were built from scratch, at least as much as anything is. They developed their own rocket engines and most of the components as usual aerospace components were too expensive to hit the price they were targeting.
Boom is certainly an extremely risky startup (as was SpaceX)... but isn't that what venture capital is for?