When flying for an extended period of time, it only makes sense to sit in comfort if you can. That didn't stop this woman's stepsister in law from flipping out that she couldn't fly in style too! This woman asked r/AmItheA**hole if she was in the wrong when a fight cropped up between her and her step sis. Both have children – the OP has a 5 year old, while her SIL has a 7 year old. They decided to travel together for a visit to South Africa, though they booked their flights separately. The OP n…