It seems no airport bus after 17:00. It costs about 150-200RMB, 1.5-2 hours from the airport to the hotel. The first bus to the airport is at 6am. Anyway, few airport buses. There is bus from Jiuzhaigou to Huanglong at 7am and it costs 2.5 hours. There seems to be a bus in the afternoon. But I forget the time. You can confirm all these information in advance by asking the staff in the hotel. It is better to rent a vehicle there. Public transportation is not convenient there, although it is expensive to rent a vehicle. It will be better if you can share a van with others.