A. The database uses the International Civil Aviation Organization (ICAO) identifiers for airport names. Under the ICAO convention, all airports within the continental United States that utilize all letter identifiers (i.e., LAX) will be preceded with the letter K. For example LAX, STL, MCI would all be entered in the unit for the airport locations as KLAX, KSTL,KMCI. Any airports that use a numbering system such as 51K, H34, 7M5 would not have the K prefix and would be entered as the simple three character identifier (51K, H34, 7M5).

Many counties use a two-letter prefix under the ICAO standard. In this case, the original three letter identifier is abbreviated to two letters and the country code prefix is added to create the four-letter ICAO identifier. You can contact our technical support department for more information on these codes.