Air California was founded in 1966 and started flights in '67 with Lockheed Electras. Evenually DC-9's, MD-80's, 737-200's, 737-300's and even a few BAe 146's were added to the fleet. The name was changed to AirCal in 1981.
They were based at John Wayne Airport in Orange County, Calif (don't believe it was named John Wayne in those days!) and competed directly with PSA. At one time or another AirCal served all the big airports in California and most of the smaller ones including Sacramento, Palm Springs, Long Beach, Fresno, Monterey and Tahoe Valley airport in South Lake Tahoe.
Outside California they flew to Seattle, Portland, Reno, Las Vegas, Phoenix and even flew to Chicago O'hare, Vancouver, and Anchorage. All of these distnations were not served at the same time.
American took 'em over in 1987 to bolster their West Coast operations..then dismantled most of AirCal's route system..then bought RenoAir a little over a decade later for the same reason..to increase their West Coast presence!
American still has the largest operations out of Orange County's John Wayne Airport, due in part by their take over of AirCal.