The American Douglas corporation announced the launch of the DC9 programme in April 1963. At that time the main competition was the British-built BAC 1-11. Rear... » 

The American Douglas corporation announced the launch of the DC9 programme in April 1963. At that time the main competition was the British-built BAC 1-11. Rear-mounted engines were popular because of ease of maintenance and reduced cabin noise and the design proved to be remarkably successful. «