Navy C-9 Skytrain airplane model. Among the Navy's proud possessions are the McDonnell Douglas C-9B Skytrain II transports. These twin jets have brought the Navy into the jet transport age, replacing outmoded piston-engine transports as combined personnel/cargo haulers.
The prototype DC-9 flew on 25 February 1965, and DC-9s have since become the most widely used twin-jet airline transports. The DC-9 has grown considerably in dimensions-and gross weight--over the four basic model series built to date, with the Navy choosing one of the stretched models.
In common with other convertible passenger/cargo versions, the C-9Bs differ from standard airline aircraft in having a large cargo door on the port side of the forward fuselage, along with other necessary cargo-handling features. All other details are essentially the same as airline models.