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
Washington State Route 510 also became (I-5) in 1968. SR 510 between I-5 and Pacific Avenue was reconstructed and widened in late 2003, with the addition of a roundabout at the Pacific Avenue intersection. The I-5 interchange will be replaced in 2020 with a diverging diamond interchange that began construction in October 2018. The interchange will be the first diverging diamond constructed in Washington and is estimated to cost $72 million, with funding provided by the state legislature's 2015 Connecting Washington package. State Route 510 Alternate, also known as the Yelm Loop, is a partially completed bypass of Yelm. The first, section opened to