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How you measure that at the gate

As a person who has done weight cuts for weigh-ins, I imagine weighing in at the gate leads to hungry, dehydrated people who get weighed and then immediately eat and re-hydrate. I'm not sure plan bathrooms are suited to the consequences of that.

Some people may suffer by their own actions, but I think a larger number of people may just get into the habit of living a healthier lifestyle specially if they fly a lot to make this worthwhile. Sort of like making wearing seatbelts mandatory, it adds years to your life, while making many uncomfortable an extra bit every time they drive.

The weighing could be done at the end of the flight.

End of flight weigh ins incentivizes dehydration during the flight.

It's possible some people will actually get healthier. However, it's also much easier to lose 10lbs from dehydration and pooping than from losing fat (from my experience).

They will find a way. Especcialy if they can charge extra.

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