My mum & I want to catch the KTT to Kowloon (HK) on the day we arrive in Guangzhou (this weekend). How much is the subway ticket from (Baiyun) South Airport to Guangzhou East Railway? How long is the journey? Can we buy KTT tickets at (Baiyun) South Airport subway station or do we have to buy the them at Guangzhou East Railway station? We're arriving around 6am on Saturday, what time does the first KTT depart for HK? Thanks!