Australia’s Darwin Volcanic Ash Advisory Centre (VAAC) released multiple advisories on 21 July after Indonesia’s Mount Semeru and several other volcanoes sent plumes up to Flight Level 150 (about 15,000 feet). A 17:10 UTC bulletin warned of ash drifting east at 15 knots, prompting route managers to consider tactical deviations on popular Australia–Singapore and Australia–Jakarta corridors that overfly Java. Although no Australian commercial flight paths were immediately closed, airlines including Qantas, Jetstar and Virgin monitor Darwin VAAC data in real time and have authority to reroute or delay services if ash encroaches on engine-critical airspace. The advisory comes at the start of Australia’s school-holiday peak, when thousands of leisure travellers head to Bali and beyond; any further ash dispersal could trigger airport closures similar to the major disruptions seen in 2022. Global-mobility teams should keep travellers’ contact details current and ensure itineraries include buffer days for return to duty. Employees transiting through Indonesian hubs should sign up for airline SMS alerts and consider travel insurance that covers natural-disaster disruptions. Organisations with time-critical freight in belly-hold cargo may also need contingency routings via Kuala Lumpur or Bangkok if flight crews are forced to operate east-coast detours.
