Taxi from Sofitel Wanda Hotel to harbin airport early in the morning

Our flight CZ 8739 departs at 09:30. At what time should we go by taxi from our hotel? It seems to me that at 06:00. Right? I have noticed that there is a special kind of taxi - more expensive, cars are bigger and of brown color. We took such one from the West train station to Sofitel Wanda hotel. Other passengers avoided it. Taxi meter showed 12 instead of usual 8 and the total fare was 73. How much would it cost from our hotel to airport by such taxi?