"Jumbo" Jets Please

Once again the topic of obese passengers travelling on airlines has arisen. There is nothing worse than sitting beside a huge, overweight, obese or whatever you want to call it passenger. Most airlines do not care about the size of their passengers and if they overflow into their neighbour's seat that's their problem. I travelled from Heathrow to Auckland with two very large women behind me. They took turns on this longhaul flight of standing in the aisle so the other could have more room. From a safety perspective and for other passengers' comfort this should not have been allowed. What I want to know is how the heck they fit into those tiny toilet cubicles. Maybe airlines could do a toilet test - if you fit in comfortably (and that doesn't mean a squeeze or holding your breath or worse) you get on the plane. Oh the joys of flying cattle class and the problem is only going to get bigger!!