OBT - Off-Block Time

Airport Collaborative Decision-Making (A-CDM) describes different terms for OBT:

SOBT (Scheduled Off Block Time): The time that an aircraft is scheduled to depart from the parking position.
EOBT (Estimated Off Block Time): The estimated time that an aircraft will start movement associated with departure.
TOBT (Target Off Block Time): The time that an aircraft Operator or Ground handler estimates that an aircraft will be ready to startup/pushback immediately upon reception of clearance from the tower.
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.
AOBT (Actual Off Block Time): The time the aircraft pushes back/vacates parking position.

See Also