Italy's Mount Etna erupted overnight, spewing hot ash and lava into the air, causing travel disruptions in and out of the Italian Island of Sicily and leaving Catania International Airport closed on Thursday. The billowing smoke from the eruption affects proper visibility for pilots, which is why arrival flights and departures have been delayed on one of the busiest travel days.

It's estimated that flights will resume at 6 p.m. local time Thursday, though the airport has advised passengers to check their flight status before heading to the airport. The travel snarl interfered with one of Italy's biggest national public holidays, Ferragosto, which celebrates the height of summer.