Plane size: 150
Change that any random person has covid 7.5
Change that any random person has omicron 1.1
Chance that "someone" on the plane has covid: 0.99999
Chance that "someone" on the plane has omicron: 0.7785
So, you can expect someone on your plane to have covid, but 23% of the time no one has omicron.
Fly once and not vaccinated, you get covid
If you are vaccinated you get covid only 18% of the time.
But this is not just about your chances of getting covid, I think the point is more that people who are not taking precautions are much more likely to come onto the plane as a spreader in the first place.
I really have never understood the ability of people to divorce themselves from the notion that they can also be responsible for spreading covid, not just protecting themselves from getting it.