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effective_date - Information effective date. This date coincides with the 56-day charting and publication cycle date.
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state - Associated state post office code standard two letter abbreviation for U.S. states and territories. (ex. IL, PR, CQ)
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region - FAA region code. (AAL - Alaska, ACE - Central, AEA - Eastern, AGL - Great Lakes, ANE - New England, ANM - Northwest Mountain, ASO - Southern, ASW - Southwest, AWP - Western-Pacific)
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ado - FAA district or field office code. (ex. CHI)
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city - Associated city name. (ex. Chicago)
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county - Associated county (or parish) name. (ex. Cook)
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facility_name - Official facility name. (ex. Chicago O'Hare Intl)
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ownership - Airport ownership type. (PU - Publicly owned, PR - Privately owned, MA - Air Force owned, MN - Navy owned, MR - Army owned, CG - Coast Guard owned)
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use - Facility use. (PU - open to the public, PR - private)
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location_id - Location identifier unique 3-4 character alphanumeric identifier assigned to the landing facility. (ex. 'ORD' for Chicago O'Hare)
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site_number - 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)
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arp_latitude - Airport reference point latitude (formatted)
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arp_longitude - Airport reference point longitude (formatted)
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cert_type_date - Airport certification type and date. Format is the class code ('I', 'II', 'III' or 'IV') followed by a one characther code A, B, C, D, E, or L, followed by a one character code S or U, followed by the month and year of certification. (ex. 'I A S 07/1980', 'I C S 01/1983' or 'I A U 09/1983'). Codes A, B, C, D, and E are for airports having a full certificate under CFR Part 139, and receiving scheduled air carrier service from carriers certificated by the Civil Aeronautics Board. The A, B, C, D, and E identify the aircraft rescue and firefighting index for the airport. Code L is for airports having limited certification under CFR Part 139. Code S is for Airports receiving scheduled air carrier service from carriers certificated by the Civil Aeronautics Board. Code U is for airports not receiving this scheduled service.
