<p>One of the problems airlines (and passengers) ran into when they boarded back of the plane first, is that people would put their carry-on suitcases in the overhead bins at the front of the plane to avoid lugging them down the whole plane and back again when leaving. Not everyone did it, but enough did it that the more frequent fliers up front had significantly less overhead bin space, while there were empty bins in the back. A steward’s nightmare.</p>