The prototype was built and tested in England and the design then taken over by the Naval Aircraft Factory, Philadelphia, where further modifications were made to suit their production methods under wartime conditions.

In civil service, named the Aeromarine 75, the Felixstowe F5L could accommodate 10 passengers and was operated by Aeromarine Airways on flights from Key West to Havana, carrying the first U.S. Post Office international air mail on flights from New York City to Atlantic City, and from Cleveland to Detroit.

A further civil conversion for the Atlantic Coast Airways Corporation of Delaware was reported to accommodate 25 passengers in August 1928, with talkies by First National Pictures run as a test on the inaugural flight.

The airline bought about six ex-U.S. Navy aircraft and advertised a service between Montreal, Boston, Newport, New York, Atlantic City, Charleston, Miami and Havana.

[7] Data from Flight 31 July 1919,[2] Smithsonian National Air and Space Museum:Felixstowe[7]General characteristics Performance Armament