Below: The Automobile Club of Southern California located at Figueroa and Adams Street (It's still there!).
usc digital library
Below: This is a aerial photo of the Automobile Club.
Surprisingly, there are directions painted on the roof for wayward pilots.
usc digital archive
Vail was an airport near Montebello, CA.
Another directional on the Automobile Club roof was CLOVER-10.
This was Clover Aviation Field in Santa Monica (see below...center right)
LAPL