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Note that this is a temporary promotion:

> Price guarantee is available between August 13th and September 2nd, 2019. You'll see the price guarantee badge on select flights where travel is completed by November 24th, 2019.

Still sounds like a great deal, but this explains why it's not a huge liability.

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It may be a test run. Flight pricing is complicated, Google may be reasonably worried about the unknown-unknowns.

Airlines can easily abuse this guarantee if they want to. The airline can calculate the loss Google would incur through any price change, and they don't necessarily incur the same losses. They can make price changes specifically to make sure Google flights doesn't make money.

This isn't the stock market - flights aren't transferable, since tickets are named.

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