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

Read more: The 10 Most Iconic Airplanes In Aviation History, Ranked The DC-9 was a small popular regional airliner, initially ...

Contractor: Boeing Aircraft Corporation (formerly the McDonnell Douglas Corporation ... Adapted from the civilian DC-9 airliner, the C-9 Skytrain is used primarily for personnel transport ...