DC-9-15 DeltaDC 9 Delta Airlines airplane model. Douglas launched the DC 9 development project in April 1963, intending the DC 9 as a short range companion to their larger four engine DC 8. Unlike the competing but slightly larger Boeing 727, which used as many 707 components as possible, the DC 9 was an all new design, using two rear mounted engines, a small, highly efficient wing, and a T tail. The original version had five abreast seating for 70 to 90. Mahogany