The availability of airport equipment can also be a factor. I was in Austin a couple winters ago, and it snowed for the first time in years. The airport only had one de-icing machine. Employees were not experienced in using it and at one point they actually ran out of fluid and had to go get more. Maaajor flight delays and outright cancellations. I believe the flights were prioritized based on when they were scheduled to depart. There were also complications around how long cabin crews had been working prior to taking off. (My flight baaaaaarely made it off the runway in time.)
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