Flights are scheduled about a year in advance. You’ll also see that not every city has a direct flight between them, some have layovers. Airlines have historical travel data that show where most of their travelers are going and when, and they set up routes thst are expected to be mostly full – if a route becomes unprofitable at a specific time and day, it’ll be discontinued (or new ones added if demand shows a need for it). This happens on a continual basis.
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