Air Oregon - June, 1981

Air Oregon was another commuter to expand the the early 80s. It would eventually be absorbed by Horizon Air.

https://en.wikipedia.org/wiki/Air_Oregon

Hughes Airwest - January, 1978

There are two good resources for those who wish to learn more about Hughes Airwest.  As usual, Airliners.net has a good thread here, and here's an excellent tribute website.  Interestingly, Hughes is now a part of Delta Air Lines, via Northwest and Republic.