For a replacement to arrive in the next 2 years, planes would have to be already in flight testing. Moonshots are good, aren't they? Difference between Airbus

For a replacement to arrive in the next 2 years, planes would have to be already in flight testing. Moonshots are good, aren't they? Difference between Airbus and the various Start-Up moonshoots: the former is financed by their existing business activities, while the latter is financed by VC money.