United Airlines (Chicago) is continuing separate merger talks with both US Airways (Phoenix) and Continental Airlines (Houston) according to this report by Reuters. United has also discussed the option of deepening a three-way marketing alliance between the carriers absent a merger, people familiar with the matter said.

Continental restarted merger talks with United last week, two years after walking away from almost sealing a deal. The talks are progressing fast, as much of the groundwork was laid in 2008. They are also intensifying, as United is much farther along in its discussions with US Airways.

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http://finance.yahoo.com/news/United-broaches-alliance-with-rb-50686602.html?x=0&.v=1