Summary: provided by the national airline, Alitalia. Smaller airlines include ATI, Alisarda and Aligiulia. Flying in Italy is expensive compared to the train but it can save you a lot of time. If you are prepared to arrive and return on certain days, airlines will often give you a discounted fare, but your reservation will only be accepted if you are booking the flights from Italy
Image Dimensions: 400 x 318
Image originally found here.