[manwe150]

100 lbs * 500 passengers is 50k pounds or about 10% of the max takeoff weight quoted there. Those numbers seem likely to be over-estimates, but that seems not inconsequential?

Edit: the plane holds 328-550 depending on seat configuration per the above link. I went with the upper end of that range per consideration of the “safety considerations” indicating it is the upper end of that range that is being reconsidered.

[rhodozelia]

A 777-300 holds 388 passengers, so 39,000 lbs extra would be significant.

Is the average American 100 lbs heavier than the average person from the rest of the world? Probably nowhere near that.

[gield]

22 kg (48.6 lbs) according to [1].

[1] https://en.wikipedia.org/wiki/Human_body_weight