SouthWest, Delta, American Airlines and Continental have secured over 50% of all traffic to airline websites in the US.
The usual quartet had a different player this week as Continental overtook JetBlue to take fourth place.
JetBlue has 7% market share, while US Airways and United have 6% each.
Most popular travel websites in the US for the week ending September 3 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