Sport,

I fly coach about half the time, and don' t ever recall that being an issue. I'm very careful not to let any part of me cross the line into the next seat. Plus, I'm tall enough that I never use the armrests. The person next to me gets it for themselves. It has been a few years since I weighed that much anyways.

That said, I still avoid 737s like the plague. The Airbus is far more comfortable!