Originally Posted by
speed13ird
and if the pax is registered disabled then the Captain exercising their Captaincy will have a bit of a problem
Why? What's "registered" got to do with it? A Captain is not
allowed to permit boarding of any persons likely to cause health or safety hazards to other pax. Pax unable to self-evacuate need to have the facts of life presented to them and to agree to it and as long as they don't present a hazard to others their carriage is fine. The Ops manual will specify numerical limits. If someone is either so unhygienic or sized that their presence hazards others than they MAY NOT be permitted on board. Ultimately in the real world that's the Captain's
obligation decision.
A Captain can refuse boarding to anyone they please for any reason they please. It does not need to be explained to anyone on the spot. (Though it certainly will need to be justified later)