You bought a business class ticket but your return flight was either oversold or changed to a smaller airplane, and you've been downgraded. The airline owes you a refund, but how do they calculate the fare difference? CBS News travel editor Peter Greenberg has more.

(Photo credit: Getty Images)

<p>You bought a business class ticket but your return flight was either oversold or changed to a smaller airplane, and you've been downgraded. The airline owes you a refund, but how do they calculate the fare difference? CBS News travel editor Peter Greenberg has more.</p>
<p>(Photo credit: Getty Images)</p>

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