Can I pick up an online Airport Express train ticket at the airport?

If I purchase an Airport Express one way train ticket online, can I pick it up at the airport train station? The web site mentions only HK, Kowloon and Tsing Yi stations for pick up. If I traveling from the airport and can't pick it up at the airport what is the point that I have to travel to the other stations to pick up the ticket? It doesn't sound logical!