FILE - In this June 17, 2008, file photo, a group of Chinese tourists prepare to check-in on a United Airlines flight to Washington, at Beijing Capital International Airport. Chinese tourists, already among the fastest-growing and highest-spending groups of international visitors to the United States, are poised to make an even bigger impact, thanks to a rule change that would allow visitors to get visas valid for 10 years. (AP Photo/Greg Baker, File)