Quite some years ago I flew on the same aircraft as the enormous chap who was then the recently declared world Sumo wrestling champion. Unusually, he was a Hawaiian and iirc, we were flying from Narita to Hawaii. It was impossible to get a seat belt round him even with extension belts and I think finally, rather than offload him and face what would no doubt have been huge adverse publicity, he was flown unrestrained, sprawled across either two or three seats. I was glad I wasn’t sitting in front of him!