I've heard this complaint against the airplane industry before. They overbook the plane and then the FAA won't allow them to fly at the weight they have on the plane. So they screw over the passenger and start putting bags on other planes or start unboarding passengers.
You are aware that just because they overbook a plane doesn't mean that there are actually more people on it, right? A fully loaded 737 today just weighs more than a fully loaded 737 did back when they were first being built, because now everyone's a fatass.
That said, unless FAA regs changed between then and now, I have trouble believing that fatter people would cause a plane to exceed a weight rating. The margin can't possibly have been that low.
