America makes up only 15% of revenue. And it's been growing at a snail's pace compared with overseas. But after empire building in Europe and expansion in Asia since its 2007 acquisition of, Priceline is turning more of its focus to America. It acquired U.S. online meta-search site Kayak last month. At $1.8 billion, it was Priceline's largest acquisition by far, even larger than its 2005 buy of in Europe. "If they can build up a new brand in the U.S. online travel agency market with, that would be a pretty significant win for Priceline," said analyst Mark Mahaney of RBC Capital Markets. It's a big if. Unlike the fragmented European hotel market, which is dominated by small, independent properties, the U.S. is much more consolidated. Get the full story at