[ponector]

Imagine you've spent 20 billion USD to develop, certify and create a production line. How you're going to convince airlines to buy hundreds of new planes they have no pilots for, no maintenance facilities and no predictions of reliability?

[thehappypm]

It'd be a business decision; it'd be hard to imagine a brand-new manufacturer of a competitor to the 737 doing well for that reason. But maybe a supersonic jet, or electric-powered with lower operating costs, or more automation to reduce pilot needs.. there are many ways to innovate.