When we were told it's impossible, we knew it's the right way to be done.

We built a jet airplane to get in and out of a 5,000-ft field. No one believed it could be done.

. . . It wasn't until the jet engine came into being and that engine was coupled with special airplane designs - such as the swept wing - that airplanes finally achieved a high enough work capability, efficiency and comfort level to allow air transportation to really take off.