Curtiss HA-1 was designed by Captain B L Smith of the US Marine Corps as a two-seat patrol fighter floatplane and built by the Curtiss Engineering Corporation. A-4110 is seen here probably at the Rockaway Naval Air Station in December 1918, it was eventually written off after it caught fire in the air, the pilot (Roland Rohlfs) managing to land safely. The fuselage was wood with a fabric covering it was powered by a Liberty 12 engine. Scanned from an original reproduced photograph from my collection date, and photographer unknown.

Preparing for the first flight across the Atlantic, via the Azores. The NC-3 had to land in the ocean but taxied to the Azores. The NC-4, A-2294, made it to Lisbon and Plymouth. Photo from: Bibliothèque nationale de France - Gallica

Set out on a transatlantic flight to France in May 1919 with three other NC flying boats. A2291 alighted short of the Azores and sank. Photo from: National Archives at College Park, Maryland