I believe a fliegerVizenfeldwebel was a senior NCO in the Air Service.
The picture appears at the start of the Kaiser' Bunker section on Flieger Truppen.
The caption reads 'Jasta 43 Pilots and a ground crew member taken 10 July 1918 at Haubourdin aerodome. The pilot standing in front is Vizenfeldwebel Drexler (seriously wounded), Unteroffizier Paul Rüggeberg (2 victories) is on the right, the Pilot with the left with the cane is Vizenfeldwebel Max Herman Kiep (3 victories, † KIA 15/Oct/1918). The individual on top in not identified. The aircraft is a Fokker DVII'.
I believe the unidentified pilot is probably
Ernst Wiehle (6 victories), as he appears to have the same unusual cross pinned to his tunic as worn by Wiehle in other photographs. Wiehle served in the Saxon Army but I do not recognise the cross as a Saxon award so it could be from his native Anhalt.
For those interested in Imperial German uniforms the site is well worth a look
http://www.kaisersbunker.com