This was mentioned about a month ago and for very good reason!
Airlines assume the normal weight of every adult to be no more than like 185-200, children much less.
If you know anything about center of gravity when it comes to the stability of an airplane you'll know that the passenger manifest contains whom should be sitting in which seat. You get a bunch of fatasses- especially crazy fatasses trying to move to one part of the plane offsets it's center of gravity and requires the pilots to trim- or in extreme circumstances have to ditch the plane due to unexpected loads on certain parts of the aircraft.
Even if you are allowed to simply pick a seat the pilots have data that will tell them they have to let the crew to inform the cabin passengers that they need to re-locate to fix the plane's center of gravity. Otherwise your ass is going to drag on the ground as you do your "rotation" (aka. takeoff pitch up) If you have a bunch of fat asses and cargo in the back of your plane the back will drag against the ground.
The center of gravity on planes is generally figured by where the wings are. You got a bunch of cargo underneath and in back, and a bunch of fatasses in the plane- you will die. Pilots take certain values in mind to determine at what speed they can take off without dragging the plane's ass along the runway.
Also the weight of a passenger is a huge part of takeoff procedures because you need to know the weight of your cargo and an approximation of the weight of your passengers.
If you have let's say a, "Fat Woman Acceptance" group going on a themed cruise and they are all 250+ when the assumed weight is 185 for an adult woman. (No fat acceptance group includes men because they think they deserve more than a fat man.) - that plane has little to no chance of ever landing on a runway. Much less ever rotating.
And good on the airlines! They charge more for extra luggage, they should charge more if you are an extra person. Especially one that complains that the seats are too small or you need a seatbelt extension.
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