After Hotwire surprised many last week after overtakingTravelocity, it's now the turn of Kayak to leapfrog both brands and become the fourth most popular intermediary site in the US.
Kayak added just a fraction to its share of traffic in the category, but decreases for both Hotwire and Travelocity allowed it to climb two places.
Market leader Expedia lost almost 0.5% of its own.
Most popular travel websites in the US for the week ending February 25 2012:
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Destinations and Accommodation
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Travel search terms
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NB: Data couresy of Experian Hitwise