The 'Top Banana in the West' was their slogan and bright yellow airplanes is what they flew.
Hughes Airwest as in Howard Hughes, purchased Airwest in 1970 which was a mix of other airlines going back to 1941. The airline was mostly flying in the western part of the USA with service into Canada and Mexico. The airline was sold to Republic Airlines in 1980. Republic was also an airline made up of other airlines and was itself purchased by Northwest in 1986, which is not owned by Delta.