Do celebrities fly on planes with the public?

Yes they do. I know this girl that has a mom and shes a flight attendant and Justin Bieber was on the plane but he had coach or first class I don't remember but one or the other. Most celebrities don't trust private jets because half of them aren't very safe as real planes, they don't care if fans or whatever are on the same plane as them they care for the safety reasons and they wanna feel normal so why wouldn't they go on a regular plane? I mean, if you trust private jets and the person that drives them and has enough money for it then they can go ahead, all of them are rich enough to buy like 5 private jets or more, most don't trust it.. I wouldn't either.