A Jagdstaffel (plural Jagdstaffeln, abbreviated to Jasta) was a fighter Staffel (squadron) of the German Imperial Luftstreitkräfte during World War I.
Before April 1916, Die Fliegertruppen des deutschen Kaiserreiches, which had been established in 1912 as the aviation service of the Imperial German Army, was largely organised in small general purpose units (Feldfliegerabteilungen, FFA Field Flyer Detachments).
Fighter aircraft already in service and their pilots were detached from the general-purpose FFA units and brought together in pairs and quartets at important locations.
Boelcke, the leading fighter pilot of the day, was called on to organise the manning, equipment and training of Jasta 2 which was to become the model for these new squadrons.
The most famous of these units was Jagdgeschwader 1 composed of Jagdstaffeln 4, 6, 10 and 11, commanded by Richthofen until he was killed, many of which flew the supremely manoeuvrable Fokker Dr.I triplane from the autumn of 1917.
A long overdue re-equipment with new types began, most notably the Fokker D.VII, which for the first time since mid-1917, gave the Jagdstaffeln equipment that matched their opponents'.
Other Jagdstaffeln soon adopted the fashion until few fighters flew in the manufacturers' finish, their fuselages in particular at least sporting the pilot's monogram or perhaps his favourite colour(s), even if the wings (as was often the case) remained in camouflage.