You may have heard airlines, airports, and the media refer to IATA winter and summer schedules. Different airlines, of course, have their own schedules, which typically vary on a seasonal basis. However, the summer and winter schedules being addressed here are IATA-defined seasons for slot allocation. These are the two times each year that slot use and allocation are assessed and adjusted.
Read More Here: What Is The IATA Summer And Winter Schedule? | SimpleFlying.com
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