Location identifier unique 3-4 character alphanumeric identifier assigned to the landing facility. (ex. 'ORD' for Chicago O'Hare)
Region
FAA region code.
Site Id
Landing facility site number - a unique identifying number which, together with the landing facility type code, forms the key to the airport record. (ex. 04508.*A)
State Id
Associated state post office code standard two letter abbreviation for U.S. states and territories.