There are frequent, direct regional (not high speed) trains from Bologna to Ravenna. You can book local transport from Ravenna to the ship here: https://www.visitravenna.it/en There is a monorail directly from the Bologna airport to Bologna Centralle train station. No need to book regional trains in advance. They are fixed price and do not sell out. In the past Celebrity has run shuttles to the ship from the Ravenna train station BTW, taxis are in short supply in Ravenna on the morning any ship embarks so don't count on being able to get one.