They did it 1993 and it cost $101 million adjusted for inflation. https://en.wikipedia.org/wiki/McDonnell_Douglas_DC-X#Flight_testing https://en.wikipedia.org/

They did it 1993 and it cost $101 million adjusted for inflation. https://en.wikipedia.org/wiki/McDonnell_Douglas_DC-X#Flight_testing https://en.wikipedia.org/wiki/McDonnell_Douglas_DC-X#Flight_...