The Grumman C-1 Trader is a carrier onboard delivery (COD) variant of the Grumman S-2 Tracker. It was replaced by a similar version of the Northrop Grumman E-2 Hawkeye, the Grumman C-2 Greyhound.
Grumman C-1 Trader
Grumman C-1 at Willow Grove
C-1A on board USS Coral Sea
Carrier onboard delivery (COD) is the use of aircraft to ferry personnel, mail, supplies, and high-priority cargo, such as replacement parts, from shore bases to an aircraft carrier at sea. Several types of aircraft, including helicopters, have been used by navies in the COD role. The Grumman C-2 Greyhound has been the United States Navy's primary COD aircraft since the mid-1960s.
USS George Washington (CVN-73) crew unload mail from two C-2A Greyhounds in 2011
A Gannet COD.4 from HMS Victorious (R38) aboard USS Bennington in 1965
A C-1A Trader in 1987
US-3A of VRC-50 in 1987