Landmark stat for Southwest after the airline continued its dominance of the web amongst US carriers, securing double the amount of traffic traffic of its nearest rival.
Delta, in second spot, lost 0.75% market share between January and February this year as Southwest added 2.25% over the same period.
Third placed United experienced a minor drop of 0.20%, as did American Airlines with a similar figure.
Most popular travel websites in the US for February 2013:
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Destinations and Accommodation
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Travel search terms
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NB: Data couresy of Experian Hitwise