International visitors to the U.S. will decline by about 3% next year, according to the Travel Industry Association, hurting hotels, car rental companies, restaurants and more. Airlines could be hardest hit, according to experts, because many have been counting on international demand to shore up weakness on domestic routes. "The international piece has been the growth story -- the only growth story -- over the last three or four years," says William Swelbar of the MIT International Center for Air Transportation.

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