Originally an irregular air carrier, the airline was certificated as the first US transatlantic scheduled cargo airline in 1955 by the Civil Aeronautics Board (CAB), the now defunct federal agency that, from 1938 to 1978, tightly regulated almost all US commercial air transportation.

Seaboard's headquarters were on the grounds of John F. Kennedy International Airport in New York City.

[citation needed] In 1955, it received final approval on CAB certification to fly scheduled cargo services across the Atlantic.

[4][5] After fuel and passengers were offloaded, the plane was towed to the north overrun and departed five hours after the landing incident.

[citation needed] The airline merged with Flying Tiger Line on October 1, 1980, resulting in the loss of its corporate identity.