Russische Ballonabteilung nächst Wyszkow

The Imperial and Royal Aviation Troops (Kaiserliche und Königliche Luftfahrtruppen or K.u.K. Luftfahrtruppen) was the air force of the Austrian-Hungarian Empire until the empire's demise in 1918. It saw combat on both the Eastern Front and Italian Front during World War I. Despite being much smaller and usually less technologically advanced than the German or British air forces, it performed with tenacity and bravery during the war.

WWI photographs from Österreichische Nationalbibliothek - Austrian National Library