Charter not RPT but ...
I know of at least one set of charter flights (6 seater aircraft) where only 3 of 5 potential passengers could be taken due to weight (they were a group of 5 very large gentlemen).
They were not happy but the aircraft would have been overweight with 4 passengers on board (the pilot was only 62kg when ready to fly).
By the way, having a quick look at the DDA, I don't believe weight / size is considered to be a disability.
cheers
layman