Southwest has seen its lead over second place in the list of leading airline websites fall to under 10% market share, as Delta and United start rising up the table.
Delta managed to increase its share of the airline category by over 0.5% last week, while United jumped by around 0.75% over the same week-on-week period.
Southwest fell by almost 1%.
Most popular travel websites in the US for the week ending April 14 2012:
Agency
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Destinations and Accommodation
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Airlines
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Travel search terms
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NB: Data couresy of Experian Hitwise