North Pacific Airlines North Pacific Airlines North Pacific Airlines was a commuter air carrier formed in 1987 which operated scheduled passenger service on behalf United Airlines via a code sharing agreement as an United Express carrier initially from the Seattle–Tacoma International Airport (SEA) to three destinations in Washington state and also to Portland, Oregon. By 1989, the airline had expanded its route network and was serving fifteen destinations located in Idaho, Montana, Oregon and Washington state (see destination list below). In 1991, the airline, which was owned by WestAir Holding, Inc., was merged with WestAir Commuter Airlines which operated flights in California and
Seaboard World Airlines connect McChord Air Force Base, Washington with Cam Ranh Bay, Vietnam. In 1968, one of these flights operating as Seaboard World Airlines Flight 253A was forced to land in the Soviet Union with 214 American troops on board. On 30 April 1969, a Seaboard World Airlines DC-8 with 219 passengers and 13 crewmembers landed by mistake at Marble Mountain Air Facility, when it had actually been cleared to land at the nearby Da Nang Air Base. After fuel and passengers were offloaded, the plane was towed to the north overrun and departed five hours after the landing incident. Seaboard was