The DC-9 quickly became popular because of its economical operation and efficient design. The McDonnell Douglas DC-9-20 ...

The DC-10 outsold Lockheed's L-1011 Tri ... when it designed the X-32A. Of those four planes McDonnell Douglas had in ...

The Delta Clipper, as the McDonnell Douglas single-stage-to-orbit ... uncomplicated vehicle that would make spaceflight affordable, the DC-X crashed and burned—literally—on its 12th flight ...