Marriott International’s portfolio has grown to 1.25 million hotel rooms worldwide, Since its $13 billion merger with Starwood Hotels & Resorts. But the company’s boss Arne Sorenson said there is still room for growth. The U.S. is Marriott’s biggest markets, but China is growing faster with 300 mostly luxury hotels and another 300 under construction there. In regards to the competing home-sharing company, Airbnb, Arne Sorenson isn’t worried. “I don’t know anyone knows as competitors where they’ll be a decade from now.” Arne Sorenson