Starting July 11, there will be new Frecciarossa trains serving Rome Fiumicino Airport, going to/from Naples and Florence without needing to change at a central Rome station:
Frecciarossa 8335 Fiumicino Aeroporto 9.38 - Napoli Centrale 11.33
Frecciarossa 8334 Napoli Centrale 5.45 - Fiumicino Aeroporto 7.52
Frecciarossa 9591 Firenze Santa Maria Novella 07.05 - Fiumicino Aeroporto 09.22
Naples is getting this service for the first time. For Florence, they aren't yet resuming the train they had leaving FCO shortly after 11 a.m.; the first direct train leaves at 13.53, well after most transatlantic arrivals.
Frecciarossa 8335 Fiumicino Aeroporto 9.38 - Napoli Centrale 11.33
Frecciarossa 8334 Napoli Centrale 5.45 - Fiumicino Aeroporto 7.52
Frecciarossa 9591 Firenze Santa Maria Novella 07.05 - Fiumicino Aeroporto 09.22
Naples is getting this service for the first time. For Florence, they aren't yet resuming the train they had leaving FCO shortly after 11 a.m.; the first direct train leaves at 13.53, well after most transatlantic arrivals.