Give priority to interphone transmissions as follows:
First priority. Emergency messages including essential information on aircraft accidents or suspected accidents. After an actual emergency has passed, give a lower priority to messages relating to that accident.
Second priority. Clearances and control instructions.
Third priority. Movement and control messages using the following order of preference when possible:
Progress reports.
Departure or arrival reports.
Flight plans.
Fourth priority. Movement messages on VFR aircraft.
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