Crew push an helicopter at a base in Xi'an, Northwest China's Shaanxi province, July 13, 2015. Didi Dache, China's leading taxi-hailing app and backed by Tencent Holdings, has joined with China Xi'an Airventure Association to provide a helicopter hailing service that includes three routes, with flight times between 10 and 20 minutes and at a cost of 998 to 1498 yuan ($160-$241). [Photo/CFP]
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