I'm off to Rome in less than one day and just realized I did not look into this earlier!
I am arriving in Rome and taking some other train (sub suburban train) and not the Leonardo Express train to my hotel. However I will be leaving from Rome on the Leonardo Express train (don't ask, long story) but it involves the fact that we are changing hotels.
I just realized I won't be able to buy the ticket then. Is the 14 Euro ticket one way or two way? Why can't I buy the ticket at Termini station to the airport? Can I just buy a one way ticket when I land at FCO for my trip to the airport back? Help!