Some suggest that you may want to use Facebook or LinkedIn profile to fill the airline seat next to you. I’m not convinced. Here’s an idea:
Why don’t we use Kinect or the like to get a quick body scan of people when they enter a venue or the check-in area and then we base the seat assignment on mixing and matching the chunky folks with the slender.
Watching my beloved Red Sox for the last three days (sweeping the Rays no less), I couldn’t help being impressed by the sheer size of some of the spectators behind home plate. Clearly there’s room for improvement.
olivergajek 
Good one… from a technical point of view it shouldn’t be too difficult to classify people into groups.
The question is if you sit all the chunky folk next to each other or punish the slender by mixing everyone like a chess board 🙂
Good idea! A nice incentive for everybody to slim down a bit.