AirCal started out in 1967 as Air California, serving points in the Golden State from their base at Santa Ana Airport (now known as John Wayne Orange County Airport). After Deregulation went into effect, their route network expanded to points as far away as Seattle, Vancouver, Portland, Phoenix, and Reno while they were embroiled in an intense rivalry with Pacific Southwest Airlines (PSA).
American Airlines bought out and absorbed AirCal in 1987.