Not long ago, Frontier Airlines introduced an all-you-can-fly air pass, which gave you a year of unlimited travel on the airline. Other airlines are following suit. CBS News travel editor Peter Greenberg has more.

<p>Not long ago, Frontier Airlines introduced an all-you-can-fly air pass, which gave you a year of unlimited travel on the airline. Other airlines are following suit. CBS News travel editor Peter Greenberg has more.</p>

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