Carrier SouthWest has almost a quarter of all traffic to airline websites in the US this week, with Delta also commanding a 14% share of the category.
Third placed American Airlines added a nominal 0.25% on its previous showing, but JetBlue lost its fourth position to Continental.
Most popular travel websites in the US for the week ending October 15 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