I know several people who are 350lbs and they use the COS all the time without issue
my suggestion is to book the 2nd seat in advance because if the flight is sold out when you get to the counter and you haven’t purchased the seat you could be denied easier because they usually have to get a supervisor for permission to oversell the flight. Booking in advance will reduce the chance of being questioned if you are boarder line (remember it’s not about weight but if you fit in the seat) weight is not distributed the same on everyone so if you think you need it do it (extra space is nice)
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