Seaboard World Airlines Flight 253A was a military charter flight carrying 214 American troops bound for South Vietnam. On July 1, 1968, the plane was intercepted by Soviet jets after it unintentionally violated Soviet airspace. It was forced to land on one of the Soviet-controlled Kuril Islands with all 238 Americans aboard being detained for two days.

Seaboard World Airlines was an international all-cargo airline based in the United States. Its headquarters were on the grounds of John F. Kennedy International Airport in New York City.