The U.S. Travel Association said this week that international travel to the United States "continues to defy the expectations of many," growing 5.2 percent year-over-year for the month of May.

"There is widespread talk of daunting challenges to the U.S. travel market -- perception of the country abroad is mentioned most, but the strong dollar and slowing global economy are factors as well -- yet the resilience of our sector continues to astound," said U.S. Travel Association president Roger Dow in a written statement.

But some industry officials remain cautious about the outlook going forward as the United States puts into place heightened security measures and a revised travel ban takes effect.

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