Estimated Time of Departure (ETD)
Estimated Time of Departure (ETD)
Definition
Estimated Take Off Time. The expected take-off time determined manually or automatically in advance.
Source: EATM Glossary of terms
Description
The estimated time of departure (ETD) is based on the scheduled time of departure (STD). Ideally, ETD = STD + taxi time, but in most cases there are deviations due to various factors, e.g. assigned CTOT, delays due to de-icing or traffic congestion, etc. ETD is mostly used in the operational environment and is the base for en-route estimates and estimated time of arrival (ETA) calculation.
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