On Trenitalia.com I searched Fiumicino Aeroporto-Napoli Centrale on the random date of April 7, and the results include these:
That is, the departure at 9.38 doesn't have the "1 change" (or more) that the other trains on that route list. You say you're going in September and the schedules aren't posted yet. The schedules could change, but for now with a flight arrival at 11 you'd need to change, probably at Roma Termini.
That is, the departure at 9.38 doesn't have the "1 change" (or more) that the other trains on that route list. You say you're going in September and the schedules aren't posted yet. The schedules could change, but for now with a flight arrival at 11 you'd need to change, probably at Roma Termini.