Pre-War Unaffiliated

A-C: Air Ferries, Airline Feeder System, Alaska Washington Airways, Bowen Air Lines, Brower's air Service Corporation, Central Vermont Airways, Canadian-American Airlines, Cape Cod Seaplanes, Capital Airlines, Capitol Airways, Capitol Speed Lines, Cardiff and Peacock Airlines, Central Airways, Central Ohio Airways, Chadbourne-Donze Air Services, Champlain Air Transport, Chesapeak Air Ferries, Chicago-Detroit Airways, Coast Airways, Columbia Airlines, Commuters Air Service, Condor Air Lines, Consolidated Air Lines, Contintental Air Express, Continental Airways, Curtiss-Wright Flying Service (Curtiss Flying Service) D-L: Dixie Flying Service, Fogg Farnsworth Flying Service, Gilpin Air Lines, Gorst Air Transport, Grand Canyon Boulder Dams Tours, Hampton Air Service, Hunter Airways, Inter City Airlines, Island Airlines, Isthmian Airways, Keystone Airlines, Land "O" Lakes Airlines, Licon Airways, Los Angeles Airways M-Z: Main Flying Service, Maine Air Transport, Marine-Air Transport Company, Mason and Dixon Air Lines, Metropolitan Air Ferry Service, Miami Aero Corp., Michigan Air Express, Middle States Air Lines, Midland Air Express, Mutual Air Lines, National Airline Taxi System, New York Airways, Oklahoma Airlines, Overland Airway, Ozark Airways, Pittsburg Airways, Portland Airways, PRT Air Service, Rapid Air Transport, Mamer Air Transport, Reed Airline, Robertson Air Lines, Richmond Air Trasnport and Sales Corporation, Rogers' Air Lines, Seaboard Airways, Seacoast Air Transport, Seattle Vancouver Airways, Shobe Airlines, Skyway Incorporated, Paul Strasburg Flying Service, Trump Airways, United Stats Air Transport, Union Air Lines, Varney Speed Lines, Viair Lines, Washington Flying Service, Watertown Airways, Western Air Service Corp., White Mountain Airlines, O.J. Whitney Inc. Flying Service, Wilmington-Catalina Airline, Yellow Cab Airways