Italy offers an extensive network of internal flights. Airport taxes are included in the price of your ticket.
The privatised national airline, Alitalia, is the main domestic carrier, and numerous low-cost airlines also operate across the country. Useful search engines for comparing multiple carriers' fares (including those of cut-price airlines) are www.skyscanner.com, www.kayak.com and www.azfly.it.
Etihad Regional (www.etihadregional.com)