The HK Station check is great!
I was kind of hoping the agents would be "clueless" about the SWUs & upgrading, but alas they were totally up to speed.
In fact this was the only time where I've seen them take the SWU, stamp it "used", AND write the ticket number on it. No hope of anyone using that one again.
Just love that airport train! Clean, fast, quiet, drops you right in the terminal. What more could you ask for except the Dom? The U.S. is soooo far behind in these transportation areas. (Anyone at METRO in D.C. listening? or Chicago???)