I reckon I'm about average, and I'm just over 18 inches from outside shoulder to outside shoulder. With nowhere to go side to side, me in a middle seat is going to be force me on either side of me to lean slightly to the window side and aisle side to avoid touching me. Doesn't sound too comfy for 17 hours (except for me in the middle
). If either of the me's on the outside refuses to budge, then the other me's are going to be
really uncomfy.