Well it's happened with Samoa Air.They are the first airline to charge people for tickets based on their weight. No flat rate for your seat anymore. Now the question is, will this take off and other airlines follow suit or will it just die and go down in history as a bad idea. I know a lot of people would start their weight loss program before going on vacation to save on the flight. But when you come back you find you've gained 15 lbs and can't afford the plane ticket to come home. Well it's a thought.