In the header of your AGOA turnaround view, you will find several acronyms:
Arrival flight (left-hand side)
STA: Scheduled Time of Arrival according to the IATA seasonal schedule
RTA: Rescheduled Time of Arrival, published by airline OCC. Do not edit unless explicitly instructed by the airline.
ETA: Estimated Time of Arrival at your station, published after takeoff from origin
ATA: Actual Time of Arrival at the parking stand, or Actual in-block time (AIBT)
ADO: Any Door Opened is the actual time the first aircraft door was opened
Aircraft (middle)
MTT: Minimum Turnaround Time is the shortest amount of time an aircraft can be turned between in-block time and off-block time.
Departure flight (right-hand side)
ADCT: All Doors Closed Target is the time the last aircraft door must be closed
ADC: All Doors Closed is the closure time of the last aircraft door
ATD: Actual Time of Departure from the parking stand, or Actual off-block time (AOBT)
STD: Scheduled Time of Departure according to the IATA seasonal schedule
RTD: Rescheduled Time of Departure, published by airline OCC. Do not edit unless explicitly instructed by the airline.
PTD: Projected Time of Departure is calculated by the system in case of late arrival of inbound aircraft (LIAC). Calculation: Late in-block time (ATA) + MTT = PTD.