Delta has less than half the amount of share of website traffic than rival carrier Southwest, after the low cost airline made further gains last week.
Southwest added around 1.75% to its share of traffic in the airline category as Delta managed to lose 0.75% of its own.
United, in third place, remained static with a nominal decrease week-on-week.
Most popular travel websites in the US for the week ending March 23 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