4 links
Airlines Of The Web - Airport Codes
flyaow.com
Contains IATA airport codes for almost 2000 airports throughout the world.
Airport City Codes
airportcitycodes.com
Searchable by country, US state, city,or code. Includes runway length, elevation, latitude and longitude. Includes distance between airports, and aviation-related stories.
Mapping.com Airport Codes
mapping.com
Includes both ICAO and IATA codes for over 21,000 airports worldwide.
World Airport Codes
orld-airport-codes.com
Reference site for airport codes and useful information like runway lengths, elevation, latitude and longitude data for each airport as well and WAC and GMT offset data.