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> Airlines would be interested in heavier people because they pay the most, isn't?

No, because other factors bring in orders of magnitude more money, which is why airlines cater to business travelers that buy expensive tickets last minute, not leisure travelers, that buy tickets months in advance. Weight (and the cost of fuel to move it) is only one of many factors that contribute to the total cost of airline tickets.

> And people in low economic brackets would try to lose as much weight as possible, probably getting below healthy conditions just so they can travel cheaper.

If we take baggage fees as in indicator of cost, we could assume 50 lbs will cost or save you about $30. And people are going to not only lose weight, but lose so much to be unhealthy to save…60 bucks round trip on a once yearly vacation? If giving people $60 a year to lose weight is real, we have just discovered a way to save billions on healthcare.