Before he left, Michael scanned down the aisle, almost out of habit, to see if the attendants had closed all the overhead bins. As he looked through the business section, Michael locked eyes with the passenger in seat 8D. A chill passed through him, a queasy gut feeling he couldn’t quite place and couldn’t shake. Something about Mohamed Atta’s brooding look seemed wrong. But the flight was already behind schedule, and Michael wouldn’t challenge a passenger simply for glaring at him. He turned and stepped off Flight 11, and a gate agent closed the door behind him.