A/N	Army / Navy
ADC	Airport Directory Company - commercial published directory of airports in USA
CAA	Civil Aeronautics Commission (part of the Department of Commerce)
DOC	Department of Commerce
E	East
ESE	East South East
ID	Identification
LF	Landing Field
N	North
N/S	North / South
NE	North East
NNE	North North East
NNW	North North West
NW	North West
RAC	Regional Aeronautical Chart
RR	Rail Road
S	South
SAC	Sectional Aeronautical Chart
SE	South East
SSE	South South East
SSW	South South West
SW	South West
TBD	To-Be-Determined
U.S.	United States
W	West
WAC	World Aeronautical Chart
WSW	West South West