1-4-2. CRITERIA c. Three-letter identifiers are assigned to aircraft operating agencies which operate 7 or more non-seasonal international air operations per week and/or generate the appropriate flight movement messages and other related flight operations over the Aeronautical Fixed Telecommunications Network (AFTN); or, 15 or more non-seasonal domestic commercial round trip air operations per week. Aircraft operating agencies which generate less than the prescribed international and/or domestic flight operations, may be waived as deemed advantageous to the U.S. air traffic control system and operationally appropriate by FAA. Exceptions to the above criteria may be authorized on an individual basis.
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