ICAO three-letter identifier codes are registered by the civil aviation authority of the carrier’s country of jurisdiction.  Each country may establish its own criteria for the assignment of such codes.  In the United States, requests for the assignment of a three-letter identifier should be addressed to the FAA Regional Office, Air Traffic Division.  Contact the Federal Aviation Administration for further information regarding this issue.

Non-U.S. based air carriers should submit requests for the registration and assignment of a three-letter identifier to the civil aviation authority of its country.