Any self-respecting US millionaire owned an 'air yacht', but the C-2 Air Yacht was sometimes used as an airliner, Western Air Express flying it between LA and Catalina Island. This service was taken over by Wilmington-Catalina Airline in June 1931 - see photo 356988. Photo from: San Diego Air & Space Museum
This photo was added on 29 August 2021, and has since been viewed 492 times.