McDonnell Douglas C-9
| C-9 Nightingale/Skytrain II | |
|---|---|
| A C-9B Skytrain II of the US Navy | |
| General information | |
| Type | Military transport aircraft |
| National origin | United States |
| Manufacturer | McDonnell Douglas |
| Status | Retired |
| Primary users | United States Air Force (historical) United States Navy (historical) United States Marine Corps (historical) Kuwait Air Force (historical) |
| Number built | 48 |
| History | |
| Introduction date | 1968 |
| Retired | September 2005 (USAF C-9A); July 2014 (USN C-9B); April 2017 (USMC C-9B) |
| Developed from | McDonnell Douglas DC-9 |
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The McDonnell Douglas C-9 is a retired military version of the McDonnell Douglas DC-9 airliner. It was produced as the C-9A Nightingale for the United States Air Force, and the C-9B Skytrain II for the U.S. Navy and Marine Corps. The final flight of the C-9A Nightingale was in September 2005, and the C-9C was retired in September 2011. The U.S. Navy retired its last C-9B in July 2014. The two remaining C-9s in Marine service were retired in April 2017.
Despite being officially retired, one C-9B, BuNo 161529, was seen as late as November 2020 being operated by the U.S. Air Force as an experimental sensor testbed.