In the header of your AGOA turnaround view, you'll 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 the airline's 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, the actual time the first aircraft door was opened.
Aircraft (middle)
MTT: Minimum Turnaround Time, the shortest amount of time an aircraft can be turned around between in-block time and off-block time.
Departure flight (right-hand side)
ADCT: All Doors Closed Target, the time the last aircraft door must be closed.
ADC: All Doors Closed, 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 the airline's OCC. Do not edit unless explicitly instructed by the airline.
PTD: Projected Time of Departure, calculated by the system when the inbound aircraft arrives late (LIAC). Calculation: Late in-block time (ATA) + MTT = PTD.