ICAO code uit ICAO ICAO ICAO ICAO ICAO code ICAO Code airport codes ICAO http://en.wikipedia.org/wiki/ICAO_airport_code ICAO ICAO ICAO ICAO ICOA codes ICAO airport code four-letter airport code code ICAO ICAO代码 ICAO airport code ICAO Code ICAO Airport Code ICAO airport codes entry at Wikipedia ICAO ICAO airport codes entry at Wikipedia ICAO airport code ICAO identifier ICAO