jakarta indonesian authorities prepare divert flight 10 airports across country case increasingly active volcano holiday island bali erupt disrupt travel officials warn mount agung eastern bali could erupt time prompt several countries include australia singapore issue travel advisor one world popular tourist destinations ten airports serve alternatives flight bind bali ngurah rai airport case close volcanic ash transportation minister budi karya say statement wednesday authorities also prepare ferry help people leave bali case air travel disrupt karya say airports jakarta surabaya lombok among prepare allow divert flight land bali ngurah rai international airport second-busiest country jakarta main international airport operate normally wednesday nearly five million people visit bali last year australia china japan 75,000 residents evacuate near volcano fear imminent eruption prompt travelers rethink holiday plan several airlines singapore australia say prepare disruptions flight run normally virgin australia fly bali australia say wednesday expect delay present visible ash cloud therefore flight plan operate schedule however may delay due fact bali bind flight make fuel stop darwin precautionary measure company say statement mount agung status raise high level last week authorities impose 12km exclusion zone around 4.3 magnitude quake shake area wednesday indicate seismic activity remain high officials say total number tremor decrease compare strength tremor definitely increase say gede suantika official national vulcanology agency volcano last erupt 1963 kill 1,000 people indonesia prepare divert bali-bound flight case volcanic eruption