For example: Someone buys a ticket round trip to Florida for $500, $250 outgoing and $250 returning. The return flight is now selling for $150. Yapta will alert you about the sale or drop in price so you can get your difference in airfare.
It may vary how you get your money back and some may not honor it (though most do).
A few days ago I had to give a customer a credit for $1,230!!!!! Talk about smart thinking when she used YAPTA!!!