Further reading
- Davies R.E.G., Airlines of the United States since 1914, IRLINES OF THE UNITED STATES SINCE 1914, Smithsonian Institution Press, Washington (D.C.), 1982
- Davies R.E.G.-Quastler I.E., Commuter airlines of the United States, Smithsonian Institution Press, Washington (D.C.), 1995
References
- 135 Airlines Airline History, retrieved 9 June 2020^
- 4 W Air Airline History, retrieved 9 June 2020^
- AAA Air Enterprises Airline History, retrieved 9 June 2020^