I saw a hostie on board a certain Irish airline the other day and I reckon she was no more than 4ft -6 inches , if even that , ( head and shoulders ...just... above the headrest as she passed by ) and built like a stick insect.
One assumes that she has the strength to open a 737 type passenger door without hesitation. Regarding 'fat' people the only thing a carrier can do in this day and age is increase the number of extension seat belts.
Regarding English speakers I can hardly understand youngster's English these days. They'll grow up in a world of smartfones sorry smartphones where they don't have to speak proper!