Douglas announced the launch of the DC-9 program in April, 1963. The rear-mounted engines were popular with passengers because of reduced noise levels in the cabin. Airlines were happy with the ease of engine maintenance, plus designers approved of rear-mounted engines because the wings are free from engine clutter. The design proved to be remarkably successful. Unfortunately, the Douglas company was not as successful at financial management and after amalgamating with McDonnell, it was swallowed by its former rival Boeing. What is probably the last descendent of the DC-9, now revels in the title Boeing 717.