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FS2002 ProjectAI NKS Spirit Airlines McDonnell Douglas DC-9-50. Designed to operate from short runways and on short- to medium-range routes, the DC-9 airframe has produced many variants, including five DC-9s, the MD-80 series, MD-90 and B717. All DC9 series aircraft have built-in boarding stairs for use where jetways are not available. The low ground clearance puts the lower deck cargo bays at waist height, to allow loading and unloading without a conveyor or loading platform.