Flight plan adherence:
Why a campaign and even a trial ?
When investigating those occurrences described earlier, it is found in most cases that the additional flights entered the concerned sector as a result of:
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- not flying at the initial requested flight level (RFL); or,
- departing at times different from the original estimated off block time (EOBT) or calculated take off time (CTOT); or,
- arriving in the sector earlier or later than originally planned; or,
- deviating from their original planned route; often direct routeing (DCT).
You can see the rest of the info in Eurocontrol website:
EUROCONTROL - Flight Plan & ATFCM Adherence
So the departing time should be as acurate as possible. And the exact time is the most accurate possible!