This plane was part of the "Parade of Flight" in San Diego. Looks like it is in the middle of a paint job, missing all markings except the # 9116
The McDonnell Douglas C-9 is a military version of the 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. Naval Reserve and Marine Corps. The final active-duty flight of the C-9A Nightingale was in September 2005. The Boeing C-40 Clipper (Boeing 737-700) is replacing the Navy Reserve's aging C-9B fleet.
After selecting a modified DC-9 for passenger and cargo transport, the U.S. Navy ordered its first five C-9Bs in April 1972.The C-9B aircraft have provided cargo and passenger transportation as well as forward deployed air logistics support for the Navy and Marine Corps. A C-9B was also chosen by NASA for reduced gravity research, replacing the aging KC-135 Vomit Comet.
Many of the Navy's C-9Bs have a higher maximum gross take-off weight (114,000 lb or 52,000 kg) and are fitted with auxiliary fuel tanks installed in the lower cargo hold to augment the aircraft's range to nearly 2,600 nautical miles (4,200 km) for overseas missions along with tail mounted infra-red (IR) scramblers to counter heat seeking missile threats in hostile environments.