My mum is up in arms about that fact that she **sat next to a (very) obese gentleman on her flight causing sufficient discomfort for her to grab the cabin jumpseat in cruise**. The flight was a fully-booked shorthaul flight with BA from Heathrow. 

Few airlines are willing to go the distance which for instance Southwest does with their *customer of size* policy, what can you do in this situation when it becomes unbearable?