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Weigh in on this one.
Since the cost of a first-class ticket already ensures that high-end customers pay a premium for their space at the front of the aircraft, it is unlikely that passengers flying first class would ever be charged by the pound for their ticket.
However, the weight of the passengers does impact fuel costs incurred by commercial airlines. If industry analysts have it their way, commercial airlines will soon be adding one more variable to their revenue calculations: the weight of the customer. The old profit model of per-passenger mile flown may one day add the weight of the passenger as well, because it takes more fuel to transport heavier people.