Search:

KMF Pilot:

Same insignia as #16:

Friedrich Christiansen wearing a Dornier white-top:

Deutsche Luftfahrt Verband visor in wear:

Unknown--note Lufthansa pin on his lapel:

Unknown concern:

I am not sure if this is 100% original, or what it is for, but am placing it here for now:

Close-up of Christiansen wearing a Dornier visor:

A loose example of the DVS insignia:

Same hat as post #1, but now with eagle:

Deutsche Luftfahrt Verband & Alter Adler Traditionsverband (AAT) insignia.
Credit: Bert

PLM winner Kohl in middle:

Friedrich Christiansen wearing a Dornier visor during the Weimar era:

AAT means Alter Adler Traditionsverband and was formed in 1927 out of old flyers before 1914. (thanks, Bert)
Credit: Oradour

Unknown Aero Club Visor:

This one is on Ebay right now. This could be a DLV badge attached post-war to a period civilian marine-related hat:

Front and back of DLV cap insignia:

These are often confused with the Deutsche Luftsport Verband, but are actually for the Deutsche Luftfahrt Verband:

Pilots visor for the Deutsche Verkehrsfliegerschule, or DVS. The Deutsche Verkehrsfliegerschule (DVS), German Air Transport School, was a covert military-training organization operating as a flying...

Unreferenced Aero Club Weimar visor:

Unusual flying organization visor listed as Weimar frühe Fliegertruppe Luftsportverband Mütze Offizier.

Maker is GAH, or Hoffmann: