Edmond Thieffry was a Belgian First World War air ace and aviation pioneer. He made, with Léopold Roger and Jef de Bruycker, the first successful flight between Belgium and Congo.

The Nieuport 17 C.1 is a French sesquiplane fighter designed and manufactured by the Nieuport company during World War I. An improvement over the Nieuport 11, it was a little larger than earlier Nieuports and better adapted to the more powerful engine than the interim Nieuport 16. Aside from early examples, it had the new Alkan-Hamy synchronization gear, permitting the use of a fuselage-mounted synchronised Vickers gun firing through the propeller disc.