That's a tough call for every airline. IF there is a second seat available, ASA will ask a large person to buy another seat. If there ISN'T a seat available, then what? I don't believe they can legally make the larger person get off the plane. Which gives you the option to take the next flight. It's lose-lose really.
Were there empty seats? If there were, then you should file a complaint with ASA. There won't be any reimbursement, but a good way to vent. You might get miles or a voucher.
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