"ACLT (Actual Calculated Landing Time) (Air Traffic Control)
The frozen calculated landing time of a flight. ACLT is an actual time determined at freeze calculated landing time (FCLT) or meter list display interval (MLDI) for the adapted vertex for each arrival aircraft, based on runway configuration, airport acceptance rate, airport arrival delay period, and other metered arrival aircraft. ACLT is either the vertex time of arrival (VTA) of the aircraft, the tentative calculated landing time, or the actual calculated landing time (TCLT/ACLT) of the previous aircraft plus the arrival aircraft interval (AAI), whichever is later. ACLT will not be updated in response to the aircraft's progress."
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I'm not surprised it isn't in common use.
