AIM
AIM 4-1-12
Use of UNICOM for ATC Purposes
UNICOM service may be used for ATC purposes, only under the following circumstances:
(a) Revision to proposed departure time.
(b) Takeoff, arrival, or flight plan cancellation time.
(c) ATC clearance, provided arrangements are made between the ATC facility and the UNICOM licensee to handle such messages.
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