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What's next for airlines, paying by the pound? -


Now that Spirit Airlines has done the unthinkable, announcing plans to begin charging for carry-on bags this summer -- that's right, carry-on bags -- the question everyone seems to be asking is: What's next?

Pay toilets? Too late. Ryanair, the irreverent Irish discount carrier, is reportedly considering the concept. No, the next big idea could be paying by the pound. Seriously.