The big companies pay pretty much zero in tax as well, "running" their businesses out of places like Bermuda and Liberia. Most passengers are also totally unaware of the rights they sign away when boarding as well - things like onboard doctors being immune from malpractice, no jury trials for lawsuits, the company can use any images and video of you onboard for any purposes at all, and agreeing you can't participate in class action lawsuits against the company.