ON 747 and a few others including airbus, In my experiences, the arm rests are not entirely flush. Also the tray table from the seat in front of you may not lay flat when engaged if your belly gets in the way. I just make it if the person in front is not reclined at service time. You would be more comfortable in Business if you have any chance of going that route. I am short and have a big belly - don't need 2 seats - carry weight in my tummy - and economy is a pain on long hauls (trans pac). I swear I think the DR. left one baby in there when I had my C sections lol. I really hope to have the belly problem eliminated by the time we do trans pac in Dec - one way or another. I also sleep facing the seat when we have gotten a block of 3 - but face it - nothing in E is comfortable transpac no matter what your size.