MINNEAPOLIS (WCCO) — Should overweight air passengers pay more for their tickets? A Princeton University professor says it only makes sense, since travelers already pay a fee for their oversized bags.

WCCO’s Esme Murphy put the question to her listeners and got a mixed response.

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“It’s well overdue,” said Richard from Bloomington.

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But a caller from Sarah said, “I don’t believe any large-size person would choose to be large-size.”

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Princeton Professor Peter Singer, a bioethics specialist, suggests that ticket prices be based on a standard passenger weight and those with excessive weight pay a surcharge.