[4] The term ADT (Approved Departure Time) does not have a uniform meaning
all over the world. In some regions, e.g. Europe, ADT is not even used. Instead,
other time parameters are widely utilised and clearly understood by pilots and
controllers, such as EOBT (Estimated Off-Block Time) or CTOT (Calculated Take-
Off Time). Also, some other new parameters will likely be used by ATC in the near
future, such as, COBT (Calculated Off-Block Time) or ETOT (Estimated Take-Off
Time).
Isn’t standardisation wonderful?