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Calendar and Process of Coordination

The scheduling calendar is based, not on the civil year, but on two scheduling seasons, Summer and Winter, defined as follows:

  • IATA Summer Season - starts on the last Sunday of March and ends on the last Saturday of October (where the following Sunday is still in October)
  • IATA Winter Season - starts on the last Sunday of October and ends on the last Saturday of March (where the following Sunday is still in March)

For each season, predetermined steps rule the process of coordination:

  • Distribution of SHL (Slot Historical List)
  • Submission deadline for receiving SCR
  • Distribution of SAL (Slot Allocation List)
  • IATA Scheduling Conference
  • Slot Handback  Deadline
  • Handling of Ad-hoc flights
  • Start of Season
  • End of Season
SUMMER 2021 (S21) CALENDAR OF ACTIVITIES WINTER 2021 (W21)
14SEP20 SHL Deadline 19APR21
01OCT20 Agreed Historics Deadline 06MAY21
08OCT20 Initial Submission Deadline 13MAY21
03NOV20 Appointments calendar opened to Coordinators 01JUN21
05NOV20 SAL Deadline 03JUN21
09NOV20 Appointments calendar opened to Operators 07JUN21
17-20NOV20 IATA Slot Conference 15-17JUN21
15JAN21 Slot Return Deadline (SRD) 15AUG21
31JAN21 Historics Baseline Date (HBD) 31AUG21
28MAR21 Start of the season 31OCT21