Thanksgiving is the biggest travel holiday in the US - so it is a day when a lot of people are visiting family, out of town and not where they normally should be - including a lot of first responders. That would add to the disruption of the attack - i.e. you have the chaos of the attacks and of literally millions of people trying to get home afterward adding to that chaos. And other holidays would add a lot of symbolism to the attack that could make people want revenge even more - i..e Fourth of July or Christmas Day would really be bad ideas for attacks as that would only inflame US desire to hit back and pay them back even more.
And actually hitting on Thanksgiving Day would have also lessened the US civilian casualties - i.e. a lot of people were not at their jobs at the industrial centers that were hit, instead they were at home or grandmas's or wherever celebrating the holiday. And the attacks really werent going for a lot of civilian deaths as their main modus operandi - if they were then the NY attacks would have been on Manhattan Island and Queens and Brooklyn, not the oil refineries.
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