Your browser does not support the iframe HTML tag. Try viewing this in a modern browser like Chrome, Safari, Firefox or Internet Explorer 9 or later. The possibility that the civilian jetliner downed over war-torn eastern Ukraine with nearly 300 people onboard was hit by a missile could have profound consequences for the world’s airlines. Airlines might have to be more vigilant about avoiding trouble spots, making flights longer and causing them to burn a greater amount of fuel, an extra expense …