[Godel_unicode]

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.

[giarc]

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

[londons_explore]

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.