Minnesota Public Radio slideshow:
For airlines, online trade puts the "ouch" in voucher
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Thinking of using a airline ticket voucher you bought online for a discount on your next flight? You might pull it off -- but the airlines are looking for you. (MPR file photo)

Thinking of using a airline ticket voucher you bought online for a discount on your next flight? You might pull it off -- but the airlines are looking for you.

(MPR file photo)
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