Indonesia's aviation network is slowly returning to normal after volcanic ash from Mount Anak Krakatau forced the closure of several airports and disrupted nearly 3,000 flights, affecting an estimated 341,000 passengers. The incident has laid bare the vulnerability of the country's tightly interwoven air transport and tourism infrastructure.
Jakarta's Soekarno-Hatta International Airport (CGK) and Halim Perdanakusuma Airport, along with a number of regional airports, resumed operations on Tuesday, September 8, after authorities deemed conditions safe for flight. However, the reopening does not signal a full return to normalcy.
Anak Krakatau remained active and erupted again on Tuesday, according to Reuters, prompting authorities to keep monitoring the volcano, ash dispersion, and wind patterns. The fresh eruptions could trigger further disruptions depending on the height and direction of the ash plume.
Scale of the disruption
Indonesia's Transportation Ministry reported that 2,961 domestic and international flights were affected by cancellations, delays, and diversions—2,339 domestic and 622 international. Around 341,000 passengers were impacted, as reported by national news agency ANTARA, citing Transportation Minister Dudy Purwagandhi.
The eruption occurred in the Sunda Strait, between Java and Sumatra, spreading ash across western Indonesia and prompting precautionary airport closures. The disruption escalated quickly: an earlier Reuters report on September 6 cited more than 1,500 flights and 170,000 passengers affected, before the numbers nearly doubled.
Why volcanic ash is a serious threat
Volcanic ash poses a unique hazard to aviation because fine particles can damage aircraft engines and other critical systems. Reopening an airport is not simply a matter of clearing a runway; it requires thorough inspections of aircraft, airport infrastructure, and airspace before operations can resume.
The Associated Press reported that airport authorities and airlines were required to inspect aircraft before flights resumed, while pilots and crews were instructed to remain vigilant about restricted airspace around affected areas. Indonesia adopted a cautious approach, with authorities monitoring advisories from the Volcanic Ash Advisory Center in Darwin and ground crews clearing runways, taxiways, and aprons, while airlines checked aircraft for ash contamination.
Operational and financial fallout
The closure created a significant operational backlog. Reuters reported that 178 aircraft were grounded at Soekarno-Hatta during the shutdown, and each had to be checked for airworthiness before returning to service. This illustrates why the impact of an airport closure can persist long after the airport reopens.
Airlines must not only restart cancelled flights but also reposition aircraft and crews, rebook passengers, conduct inspections, and work through accumulated delays—a domino effect that can ripple across an entire network. The financial toll is substantial: Reuters estimated the disruption could cost airlines up to 19 billion rupiah (around US$1 million) per day.
Ripple effects on tourism
The incident underscores how dependent Indonesia's tourism economy is on reliable air connectivity. A traveller may not be visiting Jakarta at all, yet still be affected if their itinerary requires a connection through the capital. International services feed into Indonesia's extensive domestic network, linking major gateways with destinations across the archipelago. When a major hub is disrupted, the effects can travel far beyond the original event.
Passengers in Bali were also affected, with flights between the island and Jakarta cancelled. Reuters reported stranded travellers at Bali's Ngurah Rai International Airport during the disruption. For hotels, tour operators, and destination management companies, this creates a second layer of disruption: a cancelled flight means a guest who doesn't arrive, a hotel booking that needs to be changed, a missed tour, or an itinerary that must be reorganised.
This event echoes similar volcanic disruptions elsewhere, such as the Etna ash cloud that hit Catania flights during Europe's peak summer rush, highlighting the global nature of such risks. For Indonesia, the recovery will be gradual, and the experience may prompt airlines and airports to refine their contingency plans for future volcanic events.
