I think you've just been really lucky.  These fatasses are everywhere.  I've had a sweaty man park his couch sized ass in the seat next to mine and 50 pounds of his sweaty, rancid belly roll over the armrest and into my lap.  He didn't attempt to move it or even apologize.  There were no free seats for me to move.  I was so grossed out I spent the entire flight standing up.  When it was time to land, I approached my seat again and found it entirely buried beneath his dripping folds.  I could barely see a third of my seat.  There was no where to sit and he wouldn't even try to return my seat.  I ended up sitting on the armrest by the guy in the other seat and hunching over so  2fe9   that hopefully the flight attendants wouldn't notice.  One did anyways and ordered the fatass to move out of my chair.  He just started bitching that it hurt his side and how it was unfair that the armrest had to pinch him while landing.  In the end, he pulled his greasy side butt off of a few inches more of the seat and I wedged myself back in.  The second the flight attendant wasn't looking, I moved back to sit on the armrest again.  I'd rather bounce around the inside of the plane like a ping pong ball rather than let that pork orc rub his filth all over me.  The human man on my other side looked ready to help me keep my balance if the landing was rough.  Luckily it wasn't.  The instant the seatbelt signs went off, I vaulted over the fatty and into the aisle before I was spotted by the flight attendants again. This is why obeasts should have to purchase two seats.  They use two.  Throwing your unwasned lard flaps over another person is disgusting and entirely unacceptable.  The only reason you don't hear people complaining more is because most people are too polite to cause a scene.