| ASBT | Actual Start Boarding Time. Time passengers are entering the bridge or bus to the aircraft. Always UTC time. |
| ASRT | Actual Start Up Request Time. Time the pilot requests start up clearance. Always UTC time. |
| TSAT | Target Start Up Approval Time. The time provided by ATC taking into account TOBT, CTOT and/or the traffic situation that an aircraft can expect start up / push back approval Note: The actual start up approval (ASAT) can be given in advance of TSAT. Always UTC time. |
| ASAT | Actual Start Up Approval Time. Time that an aircraft receives its start up approval. Note: the moment the start up approval is given can be in advance of the TSAT. Always UTC time. |
| ARDT | Actual Ready Time (for Movement). When the aircraft is ready for start up/push back or taxi immediately after clearance delivery, meeting the requirements set by the TOBT definition. Always UTC time. |
| SOBT | Scheduled Off-Block Time. The time that an aircraft is scheduled to depart from its parking position. Always UTC time. |
| EOBT | Estimated Off-Block Time. The estimated time at which the aircraft will start movement associated with departure. Always UTC time. |
| TOBT | Target Off-Block Time. The time that an Aircraft Operator or Ground Handler estimates that an aircraft will be ready, all doors closed, boarding bridge removed, push back vehicle available and ready to start up / push back immediately upon reception of clearance from the TWR. Always UTC time. |
| AOBT | Actual Off-Block Time. Time the aircraft pushes back / vacates the parking position. (Equivalent to Airline / Handlers ATD – Actual Time of Departure & ACARS=OUT). Always UTC time. |
| ERZT | Estimated Ready for De-icing Time. The estimated time when the aircraft is expected to be ready for de-icing operations. Always UTC time. |
| ARZT | Actual Ready for De-icing Time. The time when the aircraft is ready to be de-iced. Always UTC time. |
| ECZT | Estimated Commencement of De-icing Time. The estimated time when de-icing operations on an aircraft are expected to start. Always UTC time. |
| ACZT | Actual Commencement of De-icing Time. The time when de-icing operations on an aircraft starts. Always UTC time. |
| EEZT | Estimated End of De-icing Time. The estimated time when de-icing operations on an aircraft are expected to end. Always UTC time. |
| AEZT | Actual End of De-icing Time. The time when de-icing operations on an aircraft end. Always UTC time. |
| CTOT | Calculated Take Off Time. A time calculated and issued by the appropriate Central Management unit, as a result of tactical slot allocation, at which a flight is expected to become airborne. (ICAO Doc 7030/4 – EUR, Table 7). Always UTC time. |
| ETOT | Estimated Take Off Time. The estimated take off time taking into account the EOBT plus EXOT. Always UTC time. |
| TTOT | The Target Take Off Time taking into account the TOBT/TSAT plus the EXOT. Each TTOT on one runway is separated from other TTOT or TLDT to represent vortex and/or SID (Standard Instrument Departure (ref. SIDRoute)) separation between aircraft. Always UTC time. |
| ATOT | Actual Take Off Time. The time that an aircraft takes off from the runway. (Equivalent to ATC ATD–Actual Time of Departure, ACARS = OFF). Always UTC time. |
