Economic challenges in Europe, China and elsewhere apparently did little to dim vacationers’ appetite for travel as gross bookings, or the value of all travel services purchased, rose 11% to $15 billion. Growth in the number in hotel rooms sold accelerated to 26%, while rental car days increased 20.1%. “For a business our size, that’s a pretty big deal,” Chief Executive Darren Huston said in an interview, adding that the recent Greek fiscal crisis had little effect on the company’s overall business in Europe. After relying on hotel booking commissions for growth over the past decade, Priceline is now looking for more new revenue streams. Its 2014 acquisition of OpenTable expanded the online travel giant’s offerings into a new field of restaurant reservations. In May, the company agreed to buy hotel-data company PriceMatch and it has also increased its stake in China’s International Ltd., to grow its footprint in the world’s largest outbound-travel market. Get the full story at The Wall Street Journal, CNN Money and Barron's