Just got back from the Sicily tour, and wanted to let some of you know the impact of current (February 22, 2019) activity of Mt Etna on flying. Mt Etna has been spewing ash for several days which was going directly over the city of Catania and the airport there. They can't fly planes through the ash plumes. Many of not all flights were being cancelled out of Catania (where the RS tour ends). Our flight was cancelled the night before (not the last minute) but we found the airlines (Delta through whom we booked) and Alitalia (the flight operator) to be unable to help over the phone, and referred us to the overwhelmed and undermanned help desk at the airport.
The airlines on on the previous day were extremely busy, and busing people down to Siracusa, where I assume there is a small airport. Until that airport closed too. On our travel day (yesterday the 22nd), after waiting in a heartbreakingly long line at the Catania airport for help, we were re-booked on flight out of Palermo, but on our own expense to get there. That meant either a 13.5€ per person bus ride (>3 hours to Palermo train station) from the Catania airport, or a 340€ taxi ride to Palermo airport (Punta Raisa - be specific if you have to do this). There were four of us so we took the taxi, or we would not have made our new flight on time. It was worth it.
We made it home, and are still smiling about our wonderful Sicily tour, so alls well that ends well. However I wanted to warn folks who might be going on the tour soon that it might be a little more complicated than expected. I am confident that the RS folks will be monitoring and advising folks appropriately, so I wouldn't suggest changing plans or worrying about it too much based on this temporary situation. The tour was great even with this happening. And the views of Etna are worth it. Not dangerous - just a bit of bother.