scope:

PURPOSE OF THIS ORDER.

The procedures in this order explain the Federal Aviation Administration (FAA) Air Traffic Organization (ATO) process for assignment of call sign designators and associated telephonies; and describe the requirements for authorization of their use domestically within the National Airspace System (NAS) and internationally in accordance with International Civil Aviation Organization (ICAO) policies. FAA ATO assignment and authorization of call signs is an air traffic management (ATM) security measure for aircraft identification that is fundamental to the security and safety of the NAS. FAA ATO must ensure that every call sign is properly authorized, clearly related to the type of operation permitted, and is used within the NAS in accordance with its authorization.