Fully developed airfields with peacetime military activity.
They were the peacetime airfields of flying units as well as training regiments, flying schools and higher supply units (Luftzeugämter, Luftpark).
There was a communications unit attached which carried the same name as the airfield.
A for units and schools
B for Luftzeugämter and Luftparke (Supply and acceptance units)
C for Training airfields
D for training establishment of the reserve