Airlines increasingly are charging premium prices for premium seats, and experts say the new system only makes sense. "Why should someone who sits in an exit row aisle seat pay the same as someone who sits in the last row in the middle?" asks Brett Snyder, who writes the crankyflier.com blog. Airline analyst Michael Derchin agrees. "Consumers understand that when you go to the theater or a concert, you pay for location; there's one price for sitting in the orchestra, another for the back of the mezzanine," he says. Widespread acceptance is good news for cash-strapped airlines: JetBlue Airways estimates it will collect $65 million this year from travelers willing to pay for extra legroom.