Priceline.com Inc., the biggest U.S. online travel agency by market value, reached the highest in more than a decade after fourth-quarter profit and sales beat analysts’ estimates. The company has weathered the European debt crisis better than Expedia Inc. and Orbitz Worldwide Inc., and it’s expanding into emerging markets and new businesses such as car rentals. The number of countries Priceline serves has jumped more than 60 percent in the past year to over 160. “They’re seeing accelerating growth in Europe despite the macro issues that are in place,’’ said Mike Olson, an analyst at Piper Jaffray Cos. in Minneapolis. He recommends buying the Norwalk, Connecticut-based company’s shares.