Why is there such a small weight limit on the plane you board? Surely nothing passengers can bring compares to the tons the plane weighs itself.

Question

Why is there such a small weight limit on the plane you board? Surely nothing passengers can bring compares to the tons the plane weighs itself.

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Answer 1

Every bit of weight matters when it comes to fuel consumption. I remember reading about a Japanese airline asking its passengers to pee before boarding, as they estimated they could save something like 4 tons of C02 emissions every month.