Airliners, even if they lose the big engines under the wings, still have a small one in the back, called an APU, that can provide power and bleed air (!) for al

Airliners, even if they lose the big engines under the wings, still have a small one in the back, called an APU, that can provide power and bleed air (!) for all kinds of critical systems. A hypothetical airliner from the future relying on active flow control would absolutely have several redundant systems to ensure controllability.