This is not an April Fool's joke! An airline is actually charging people by their weight! Samoa Air has announced that they will weigh their passengers at the airport gate and charge them for how much they weigh.
The airline says on their website:
Samoa Air, Introducing a world first:
'Pay only for what you weigh'!
We at Samoa Air are keeping airfares fair, by charging our passengers only for what they weigh. You are the master of your Air'fair', you decide how much (or little) your ticket will cost. No more exorbitant excess baggage fees, or being charged for baggage you may not carry. Your weight plus your baggage items, is what you pay for. Simple.