As a heavy person myself I can certainly understand that there are some jobs I might be too heavy for.
The aisles are pretty narrow on commercial jets. I would look at that.
One of my work assignments required jumpsuits and parachutes. My supervisor was 6 ft 5 in and exceeded the weight limit for the parachutes on the aircraft. He was prohibited from participation. We never had to bail out from any of our flights, but it would have been bad news for him if the incident occurred.
Yep, just lie short people have a hard time playing basketball, or skinny weak people playing football, or stupid people becoming brain surgeons.