File                Description
201104_asa_all.*    FAA NFD Edition 201104 ASA airspace file with all controlled
                    and restrictive types; bounded by the turnpoint database.

201104_asa_bcdpr.*  Same as above, but with controlled airspace types B, C, D, 
                    and restrictive types Prohibited and Restricted, only
                    
201104_ ... _mex.*  A copy of a file described above, with a US-Mexico border 
                    airspace item added, covering CA, AZ and NM, encoded as
                    Prohibited