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This appears to be a time-limited promotion.

> When we predict the price won’t decrease for select itineraries booked between August 13 and September 2, we’ll guarantee the price won’t drop, and we’ll refund you the difference if it does.

When I read that I assumed that they want to observe the effect this guarantee has on pricing by changing people's booking behavior. Doing a time-limited study seems like a good way to do that.

I agree, but that seems like such a short window for an accurate assessment.

I bet its a "50% of flights" trial, so the data is more comparible.

If they have enough flight bookings per day, even a 1 day trial could be plenty to see how customers behave.

Do they say if this is US-only?

> This feature is available for select itineraries originating in the U.S. with domestic or international destinations.

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