aviateur

I think the Aircraft is a Farman F30

French pilots. Here's one of the two officers in the plane:
See notes under

I's rather a Farman F.40 (en.wikipedia.org/wiki/Farman_F.40) IMO

I can't find a record of a Captain Hoppe, but this is French Capt. Maurice Happe on the right. His picture accompanies the following article: "This is the most well-known photo of Capitaine Maurice Happe (1882-1930), one of France’s most innovative bombing pioneers. He commanded Groupe de Bombardement 4 as well as Escadrille 29. One of his biographers described Happe in this way: His tall silhouette, all sinew and muscles, in a black artillery uniform without officer’s boards or decoration, stood out against the blue of the Vosges Mountains... He [was] obsessed with one concern: accomplishing everything that was his duty. His gaze softened or turned dark depending on his mood. He was subject to mood swings; there was something of the street Arab in his personality. But when he laughed, his brilliant white teeth reminded one of a wolf’s teeth." :La Guerre Aérienne Illustrée (LGAI)" www.crossandcockade.com/uploads/EscMF29_opt.pdf

Other Bain photos of Capt. Happe:

Marcel Brindejonc des Moulinais (1892-1916), French aviator, died age 24 during WWI. earlyaviators.com/emoulina.htm

He looks much older

pennylrichardsca: Thanks for the additional information! We can expand the record for this photograph when we update.

Goes with this photo: www.flickr.com/photos/library_of_congress/3597346555/in/p...

en.wikipedia.org/wiki/Marcel_Brindejonc_des_Moulinais