I have wanted to book on-line the airport express travel pass-2 which include 2 airport express single journey plus 3 consecutive days of unlimied travel on MTR. Could anyone pls advise what it is meant by 2 airport express single journey? could I use one from airport to kowloon station upon arriving hong Hong on 3-Jan and the other one use it when I am leaving hongkong (8-Jan)from kowloon station to airport