West Coast was formed in 1941 and acquired Empire Airlines (formerly Zimmerly Airlines) in 1952. The company was based at Boeing Field, Seattle, and began scheduled passenger service in 1946. During their history, the flew a fleet of DC-3s. F-27, F-228, DC-9 and Piper Navajos. On July 1, 1968 West Coast merged with Pacific Air Lines and Bonanza Airlines to form Air West, which was renamed Hughes Airwest 1970. After the merger, Air West continued to operate from Boeing Field before eventually moving all flights to Seattle/Tacoma International (SEA). West Coast's lineage runs through a string of airline mergers: In 1980 Hughes Airwest was acquired by then newly formed Republic Airlines which had been created via a merger of Southern Airways and North Central Airlines the previous year. In 1986 Republic Airlines was acquired and absorbed by Northwest Airlines. The Delta-Northwest merger with Delta remaining remaining as the surviving air carrier was completed in 2010.