Mission: 
The C-9C is a twin-engine, T-tailed, medium-range, swept-wing jet aircraft, used to transport high-ranking government and Defense Department officials. The Air Force Reserve’s 932nd Airlift Wing at Scott Air Force Base operates three C-9Cs for operational support of distinguished visitors. 

Aircraft:
The C-9C is a modified version of the McDonnell Douglas Aircraft Corporation’s DC-9. 

Background: 
The 932nd Airlift Wing operates the C-9C for the airlift of medium-sized delegations of government and Department of Defense officials. Since 1973 the aircraft has been utilized for worldwide operations, and in the past has been used to carry the Vice President or the First Lady.
 
General C-9C Characteristics: 

Primary Function: Operational support airlift
Builder: McDonnell Douglas Aircraft Corp.
Power Plant: Two Pratt & Whitney JT8D-9A turbofan engines.
Thrust: 14,500 pounds (6,575 kilograms) each engine.
Length: 119.3 feet
Height: 27 feet, 5 inches
Wing Span: 93.3 feet
Speed: 565 mph (490 nautical miles) at 25,000 feet (.84 mach).
Maximum Takeoff Weight: 110,000 pounds (49,886 kilograms)
Range: More than 2,000 miles (1,740 nautical miles)
Ceiling: 37,000 feet
Load: 42 passengers depending on the configuration
Crew: Pilot, Copilot, Crew Chief, 4 Flight Attendants
Date Deployed: 1973
Unit Cost: $17 million.
Inventory: Air Force Reserve, 3 

Photo and information courtesy of the United States Air Force