The C-1 Trader aircraft is a Carrier-Onboard-Delivery (COD) transport plane developed by Northtrop Grumman.
The C-1 was used mostly as a transport plane during its service life. Former Belkan ace Wolfgang Buchner was known to have used the Trader during his time at Sand Island Air Force Base as a mechanic of the 703rd Maintenance Company.
At the beginning of the Circum-Pacific War, Buchner, who was called "Pops" at the time, flew the C-1 during Yuktobania's failed offensive on Sand Island and returned to base the next morning. During Operation Crossroad, a single YAF C-1 was stolen by Jack Bartlett to bring the recently-freed prime minister of Yuktobania Seryozha Viktrovich Nikanor to safety from the military government.
- The C-1 is the only aircraft in Ace Combat 5: The Unsung War that is referred to by its designation in dialogue. During Heartbreak One, when Bartlett is taxiing down the runway, a Yuktobanian soldier may say, "C-1 moving towards the runway.".