Major legacy U.S. airlines are starting to behave like low-cost airlines, and now, some low-cost airlines -- trying to stay competitive -- are suddenly looking like legacy carriers. CBS News travel editor Peter Greenberg explains.

(Photo by Joe Raedle/Getty Images)

<p>Major legacy U.S. airlines are starting to behave like low-cost airlines, and now, some low-cost airlines -- trying to stay competitive -- are suddenly looking like legacy carriers. CBS News travel editor Peter Greenberg explains.</p>
<p>(Photo by Joe Raedle/Getty Images)</p>

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