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495998804_T_WAC_COUNTRY_STATE.csv
L_WORLD_AREA_CODES.csv
README.md
airports_codes.txt

README.md

Overview

The Bureau of Transportation Statistics (BTS), which is a service of the United States Department of Transportation (US DOT), maintains a list of US state and country codes, named World Area Codes (WAC).

World Area Code (WAC) look-up table

The WAC codes themselves are listed in the so-called WAC look-up table.

World Area Code (WAC) table

The WAC table provides quite a few more details.

On Wikipedia

On OpenTravelData (OPTD)

From the BTS

Area codes for every airport

The BTS also maintains the mapping between the most important airports and those WAC codes, in a dedicated CSV file