Low cost carrier Southwest Airlines has a cushion of almost 10% in terms of market share over its nearest rival Delta in the top ten US airline websites.
The pair, alongside American Airlines, have a combined market share of 46%, compared to the 39% share captured by the remaining seven airlines in the top ten.
Most popular travel websites in the US for the week ending August 13 2011:
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