In the spring, I was surprised to hear that the delays in airports were due to the fact that people had forgotten how to travel. The real problem is the lack of staff, and it hasn't been fixed.
Right now isn't a great time to travel. The Montreal airport is short a hundred or so employees. In other airports, the word is that workers have been hired and everything will get better, but that's an illusion. There is no guarantee that the people who were hired during a less chaotic travel period will be able to deal with the pressure of the holidays, March break or next summer.
In some airports, the problem is considered to be fixed, but I say it's an illusion to think the problem can be fixed simply by replacing workers with five or 10 years of experience with new hires.
If nothing is done, the problem will get worse every year. Screening officers who left for jobs with better working conditions performed their duties more efficiently than their replacements can thanks to the experience and skills they had gained over the years.