Incredible things are happening on the weather nerd part of reddit
"Guys, looks like 9/11 is rained out. Guess we have to go back to Saudi Arabia instead of getting plane tickets next week."
I see a lot of alt history where 9/11 happens even when it wouldn't make sense given the changes so actually I applaud the OP here for contra-historically preventing it 
Edit: see https://old.reddit.com/r/worldbuilding/comments/16na4bu/should_911_still_happen_in_my_world/
i like to imagine 9/11 as a fixed point where no matter what happens in world history, at some point people start building two towers in new york and then they fall down on september 11th
What if instead of being attacked with hijacked planes the WTC had been struck by the wrath of Poseidon? Terrifying thought. Imagine how many more people would have been killed. We should tell the people who lived through 9/11 but would have been killed if they had faced the vengeance of the God of the oceans to be thankful to al Qaeda. It could have been so much worse.
Lol, of all the things. Not "what if one of many human actors at CIA for instance had a conscience"
The first time I heard this though was in the wake of Hurricane Ida in 2021... https://www.wunderground.com/article/storms/hurricane/news/september-11-hurricane-erin-missed-east-coast
one of the few decent subreddits to follow when tropical weather starts popping off.
but when nothing's going on it gets weird
I don't know much about the geo-political ramifications, but I do know we wouldn't have gotten My Chemical Romance without 9/11.