Imagine you’re dozing in your seat as your plane cruises at 30,000 feet. Suddenly a deranged passenger starts screaming “I’m gonna kill you!” and attacking flight attendants or trying to open the emergency exit or urinating in the aisle—or in a worst case scenario, breaking into the cockpit and grabbing the controls, sending the flight into a screaming dive. Unfortunately a growing number of passengers don’t need to imagine this kind of “air rage”—they’ve experienced it first hand.