Southwest saw part of its healthy lead over rival carriers eroded last week as Delta managed to add a chunk to its share of the airline website market.
Delta gained 0.75% market share week-on-week as Southwest added just 0.25% over the same period.
United lost 0.10% and American Airlines added 0.15%.
Most popular travel websites in the US for the week ending April 28 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