A Harbor Airlines apparently operated from 1974 to 2001, offering short haul service in Washington State between Seattle, Bellingham, Oak Harbor

Oak Harbor

Oak Harbor is the name of some towns in the United States:*Oak Harbor, Ohio*Oak Harbor, Washington...

, Mt Vernon

Mount Vernon

The name Mount Vernon is a dedication to the English Vice-Admiral Edward Vernon. It was first applied to Mount Vernon, the Virginia estate of George Washington, the first President of the United States...

, San Juan Islands

San Juan Islands

The San Juan Islands are an archipelago in the northwest corner of the contiguous United States between the US mainland and Vancouver Island, British Columbia, Canada. The San Juan Islands are part of the U.S...

 and Vancouver in British Columbia

British Columbia

British Columbia is the westernmost of Canada's provinces and is known for its natural beauty, as reflected in its Latin motto, Splendor sine occasu . Its name was chosen by Queen Victoria in 1858...

, Canada

Canada

Canada is a North American country consisting of ten provinces and three territories. Located in the northern part of the continent, it extends from the Atlantic Ocean in the east to the Pacific Ocean in the west, and northward into the Arctic Ocean...

 a 1976 timetable cover has been sighted).

For the latter part of this time it was a part of the Alaska Airlines

Alaska Airlines

Alaska Airlines is an airline based in the Seattle suburb of SeaTac, Washington in the United States. The airline originated in 1932 as McGee Airways. After many mergers with and acquisitions of other airlines, including Star Air Service, it became known as Alaska Airlines in 1944...

group, and was labelled as being 'Alaska Airlines Commuter Service' (a 1996 timetable cover has been sighted).

Nothing further currently known.