https://phys.org/news/2018-06-bali-airport-agung-volcano-gushes.html

The regional Volcanic Ash Advisory Center in Darwin, Australia, said winds would carry the ash southwest toward Java, Indonesia's most densely populated island. Volcanic ash is a potentially deadly threat to aircraft that can cause engines to "flame out."

The volcano began belching ash and smoke on Thursday and several airlines canceled inbound and outbound flights scheduled for the evening.