Is it worth it to fly an ultra-low-cost airline?

It's a seven-hour flight across the Atlantic at a bargain price: Low-cost airline Norwegian will jet you from New York to Madrid for $154 one way, taxes included. And the fare isn't a travel anomaly -- the likes of American Airlines and Lufthansa are all fighting for passenger pennies, offering round trip fares between various US cities and Europe for under $400.

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