Abstract
This chapter discussed the mobile services includes the maritime mobile service (MMS), the aeronautical mobile service (AMS) and the land mobile service (LMS). Some frequency bands allocated for the AMS are reserved for air traffic control on major civil air routes and related purposes; these allocations are designated AMS(R), 'R' standing for 'Route'; see RR paragraph S43.1. AMS allocations used for other purposes ('Off Route') are designated AMS(OR). RR S43.4 specifically forbids the use of exclusive AMS allocations for public correspondence, that is, for communication facilities for the use of passengers.
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