Division 7.2.1 A crossing cancellation process shall be initiated by the unit responsible for the flight when one of the following occurs:
United Kingdom
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the flight previously notified by a basic flight data process will now not enter the airspace of the notified unit or is no longer of interest to the notified unit,
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the crossing will not be executed on the route expressed in the crossing notification information,
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the crossing will not be executed according to the conditions under negotiation or according to the conditions agreed after an airspace crossing dialogue.