Hi, can I buy Roma Pass at the airport? thanks
Roma FCO airport has a Tourist Information office in terminal 3 which should sell the pass, however http://www.romapass.it/p.aspx?l=en&tid=33#faqq24 says "TEMPORARILY..." (open? closed? not sure). Or you may see the Roma Pass sign displayed at a newsstand, as in the city.
You could also consider purchasing one online before you leave for your trip and then just pick it up at any Tourist Information Point (PIT) in the city. The one at Termini station is rather convenient and is what I did last time. A list of where to pick up and more information on buying online is here: http://www.romapass.it/p.aspx?l=en&tid=8