This is not just post 9/11. Airlines have been cramming more seats onto planes[1], the quality of the seats has been going down. There didn’t used to be a single airline that had no-recline seats, now there are many. Charging for carry on or forgoing drink service to save money also wasn’t a thing until a few years ago, now it’s everywhere.

Airlines are pushing people as far as they can in order to maximize cash extraction. It’s no surprise more people are snapping.

[1] https://www.latimes.com/business/story/2022-08-11/airlines-h...