The reason was simple: just as consumers start product searches on Amazon and online searches on Google, they start travel searches on one of the main OTA sites. Those old habits are tough to break.

But old habits can still be broken…

Nowak admits that “online travel has proven to be immune to Amazon disruption so far,” but “that doesn’t mean Amazon won’t try again, and they should.” Perhaps Nowak has a point.

Amazon’s Prime member base in the US grew from 54 million in 2015 to 90 million last year according to research firm CIRP. The average Prime member spends about $1,300 annually on the site, compared to $700 for non-members. Amazon repeatedly added products like Echo and services like Amazon Video and AmazonFresh to that ecosystem, which locked in its users more tightly than ever.

As that expansion continues, the notion of introducing Prime discounts for airline tickets and hotels could gain steam. If Amazon rolls with the idea, consumers could soon be booking travel plans on their Alexa-powered devices — and gradually forgetting about traditional OTAs like Booking and Expedia.