Volcanic ash rose into the sky above Mount Etna as Europe’s most active volcano shifted its behaviour, prompting scientists to issue a red aviation alert. The Volcano Observatory Notice for Aviation (VONA) warns of a potential risk to aircraft due to ash in the airspace. Despite the alert, authorities say flights at Catania Fontanarossa Airport are operating normally, with no disruption expected unless ashfall intensifies. Mount Etna, which towers more than 3,300 metres above eastern Sicily, is