Mason, I, at 100kg (220 pounds) and 6'3 fit uncomfortably into an economy airplane seat. Even on newer planes it sucks, you are 2-3 inches shorter and about 40-50kg (80-100 pounds) heavier than me. Also I had my small wife in the seat next to me so I was taking up some of her room as well to make myself more comfortable. Good ****ing luck sitting in that seat for 12 hours. I would pre book an aisle seat and try to get the emergency exit. That way you can lean to the side more and have a bit of leg room in front.