Squawk 5200 |
US: Reserved for special use by Potomac TRACON US: Internal ARTCC subsets assigned by En Route Safety and Operations Support (Discrete codes only except for first primary block to be used as non-discrete if all discrete codes are assigned) US: May be used by DOD aircraft beyond radar coverage but inside US controlled airspace with coordination as appropriate with applicable Area Operations Directorate UK: NATO Aircraft receiving a service from AEW aircraft |