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https://i-invdn-com.akamaized.net/news/LYNXNPEB6R0AQ_M.jpgThe boost comes as China has also agreed to allow U.S. carriers to double flights to China. United Airlines said Tuesday it will increase flights to China to four flights per week from San Francisco starting Sept. 4, while the department said Delta Air Lines (NYSE:DAL) is also eligible to go from two-times weekly to four-times weekly.