Most airlines board back-to-front, an approach that makes sense, at first glance. But Steffen argues boarding back-to-front is actually one of the worst ways to board a plane. The problem, as he sees it, is this method creates traffic jams as people stuff their stuff into the overhead bins above their seats. Even if the line were perfectly ordered, only one or two people at a time would be able hoist their bags into the bins. Meanwhile, those who share their row wait behind them, blocking the overhead bins for several rows.
More at WIRED