(Last month, Boeing announced that Ed Clark, head of its 737 program, would be leaving the company, and Katie Ringgold, a long-time engineering and operations leader, was appointed to the role.) ...

The leadership changes come just one month after Boeing removed the head of its 737 Max program, Ed Clark, replacing him with former Vice President, 737 Delivery Operations, Katie Ringgold.

"We were considered to be lunatics, but we did manage to persuade the powers that be in both Airbus and Boeing that we were deadly serious," Clark says. As well as aircraft that could fly non-stop ...