Delta is just 1.5% market share ahead of American Airlines in list of leading airline websites in the US, although market leader Southwest still has double the traffic of its nearest rival.
Third placed American added 1% market share to its previous showing as Delta lost 0.25%.
JetBlue also shed 0.5% market share over the same period.
Most popular travel websites in the US for the week ending December 24 2011:
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Destinations and Accommodation
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Travel search terms
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NB: Data couresy of Experian Hitwise