Roma Pass
 

I read that the Roma Pass is available at Travel Info (TI) at the FCO airport. Where is the TI located there? We are arriving from London.

I bought the Roma Pass last week at a counter right next to the Leonardo Express train platform. I searched all over the airport terminal for the Roma-Piu pass but they kept sending me from one area to the other and telling me that it is not available. Finally, I gave up and bought the Roma pass and a train ticket (11 euros) at the same counter.

http://www.romapass.it/english/acquista/index.html
I think I read something about two different tourists booths at the airport and the pass was available at only one. According to the info on the Roma Pass webpage, it's terminal C.

We're arriving in Rome by train -- and Not to Termini but tiburtina. Where else in the city can we get Roma Passes if not at the airport or Termini?

The list of places you can buy is on the link I gave above.