What types of transportation (eg, taxi, shuttle, bus, etc) are available between the Xi'an train station and airport? If yes, how much would it cost? We're planning to take the overnight train from Beijing to Xi'an (T43), which arrives at 08:42, and then need to catch a flight from Xi'an to Jiuzhaigou at 11:35am. Is three hours enough time to get between the train station to the airport and check in for our flight?