Do you ever wonder whether a crazy passenger could open the emergency airplane exit? The answer is no, according to commercial airline pilot Patrick Smith, a columnist for Salon.com and the author of Ask the Pilot (Riverhead, $11, www.amazon.com). Cabin pressure, it turns out, is mightier than even the most deranged human. A low-down on flying high from a real pilot, this funny tell-all takes the fear out of flying by dispelling mile-high travel myths.