Major Aviation Disruption in Indonesia: Three Strategic Airports Shuttered as Mount Anak Krakatau Erupts

JAKARTA – Indonesia’s aviation sector faced a significant crisis on Sunday, September 6, 2026, as a major eruption of Mount Anak Krakatau forced the emergency closure of three primary airports, including the nation’s busiest international gateway. The volcanic activity, which sent a massive plume of hazardous ash into the atmosphere, has paralyzed air travel across the Sunda Strait region, leaving thousands of passengers stranded and hundreds of flights grounded.

PT Angkasa Pura Indonesia, now operating under the brand InJourney Airports, confirmed that the closures were mandated following a series of NOTAMs (Notice to Airmen) issued by AirNav Indonesia. The affected hubs include Soekarno-Hatta International Airport (CGK) in Tangerang, Halim Perdanakusuma International Airport (HLP) in Jakarta, and Radin Inten II International Airport (TKG) in Lampung.

As of Sunday morning, the ripple effects of the eruption have impacted nearly 500 flights across the archipelago, marking one of the most significant volcanic-related disruptions to Indonesian airspace in recent years.

1. Main Facts: The Scale of the Shutdown

The decision to declare an "Aerodrome Closed" status for three vital airports was not taken lightly. According to official data released at 09:15 WIB (Western Indonesian Time), the immediate impact was concentrated on the Jakarta-Lampung corridor, which serves as the economic heart of the country.

The Impacted Hubs

• Soekarno-Hatta International Airport (CGK): As the primary international gateway, Soekarno-Hatta bore the brunt of the disruption. A total of 301 flights were reported as affected. This figure includes a combination of outright cancellations, significant delays, and mid-air diversions to alternate airports such as Juanda in Surabaya or Ngurah Rai in Bali.
• Halim Perdanakusuma International Airport (HLP): Jakarta’s secondary airport, which handles a mix of commercial, charter, and military flights, saw 23 flights affected, all of which were categorized as total cancellations.
• Radin Inten II International Airport (TKG): Located in Lampung, South Sumatra—geographically the closest major airport to the volcano—Radin Inten II saw 12 flights cancelled, effectively cutting off the province’s primary air link to the capital.

Beyond these three primary closures, the "volcanic shadow" extended further. InJourney Airports reported that an additional 154 flights at other airports under their management were also impacted due to the closure of air corridors and the unavailability of arrival slots in the capital.

2. Chronology: From Seismic Activity to Airspace Paralysis

The crisis began in the early hours of Sunday, September 6, 2026, when monitoring stations at the Center for Volcanology and Geological Hazard Mitigation (PVMBG) detected an escalation in volcanic tremors from Mount Anak Krakatau.

The Eruption and Ash Plume

By dawn, the volcano, situated in the Sunda Strait between Java and Sumatra, unleashed a high-intensity eruption. Prevailing winds at high altitudes carried the volcanic ash cloud—composed of pulverized rock, minerals, and volcanic glass—directly toward the northeast and east, placing the flight paths of Jakarta and Lampung directly in the hazard zone.

The AirNav Response

At approximately 07:00 WIB, AirNav Indonesia’s Volcanic Ash Advisory Center (VAAC) confirmed that the concentration of ash had reached levels unsafe for jet turbines. Volcanic ash is notoriously dangerous for aviation; it can melt inside engines, causing them to stall, and can sandblast windshields, rendering them opaque.

By 08:00 WIB, the first NOTAMs were issued, initially targeting Radin Inten II, followed rapidly by the closure of Halim Perdanakusuma and Soekarno-Hatta. The decision was based on "Paper Test" results and satellite imagery showing ash accumulation on runways and within the terminal maneuvering areas.

3. Supporting Data: A Breakdown of the Disruption

The sheer volume of affected passengers and aircraft has created a logistical nightmare for InJourney Airports and domestic carriers such as Garuda Indonesia, Citilink, and Lion Air Group.

Detailed Flight Statistics (as of 09:15 WIB)

Passenger Volume Estimates

With an average of 150 to 180 passengers per narrow-body aircraft, industry analysts estimate that between 50,000 and 75,000 travelers have had their itineraries disrupted within the first four hours of the shutdown. The closure of Soekarno-Hatta is particularly damaging, as it serves as the central hub for international connections to Singapore, Kuala Lumpur, and Australia.

4. Official Responses and Mitigation: Service Recovery Action (SRA)

In response to the escalating crisis, InJourney Airports has activated its emergency response protocols. Arie Ahsanurrohim, Corporate Secretary Group Head of InJourney Airports, emphasized that the safety of passengers and crew is the absolute priority, followed closely by the management of passenger welfare.

The Service Recovery Action (SRA) Protocol

InJourney Airports has implemented the "Service Recovery Action" (SRA) to mitigate the chaos at terminal buildings. Key components of this response include:

1. Information Dissemination: Regular announcements and digital updates are being provided to ensure passengers are not left in the dark.
2. Logistical Support: At Soekarno-Hatta, the airport operator has begun distributing snacks and beverages to passengers waiting for clarity on their flights.
3. Accommodation and Transport: In coordination with airlines, buses have been deployed to transport passengers whose flights were cancelled to nearby hotels.
4. Dedicated Handling Zones: Special areas within the terminals have been cordoned off to facilitate the re-booking and refund processes, preventing overcrowding at standard check-in counters.

"The delivery of periodic information and services to affected passengers is our priority. We want to ensure that every passenger receives the necessary assistance from the airport authorities," Arie Ahsanurrohim stated in a written release on Sunday.

Furthermore, InJourney Airports has placed all personnel and ground facilities on high alert. While the airports are closed for take-offs and landings, they remain operational as "alternate locations" for aircraft parking, helping airlines manage their fleets that are currently stuck in the air or unable to return to their home bases.

5. Implications: Economic and Regional Consequences

The closure of the Jakarta airspace is not merely a localized inconvenience; it has profound implications for the Indonesian economy and regional logistics.

Economic Impact

The Jakarta-Lampung-Surabaya air triangle is the busiest in Southeast Asia. A single day of total shutdown at Soekarno-Hatta can result in millions of dollars in lost revenue for airlines, ground handling companies, and retail businesses within the airports. Additionally, the disruption to air cargo—ranging from perishable goods to e-commerce deliveries—will likely cause a bottleneck in the national supply chain for the coming week.

The "Ring of Fire" Reality

This event serves as a stark reminder of Indonesia’s vulnerability to natural disasters. Mount Anak Krakatau is the "offspring" of the infamous Krakatoa, which exploded in 1883. Since its emergence, Anak Krakatau has been one of the most active volcanoes in the world. The 2018 eruption, which caused a devastating tsunami, remains fresh in the public memory, leading to a "safety-first" culture in the current aviation administration.

Future Outlook for Travelers

Experts suggest that the duration of the closure will depend entirely on the "behavior" of the volcano and wind patterns. If the eruption continues or the wind remains static, the closures could extend into Monday or Tuesday.

Arie Ahsanurrohim urged all prospective passengers to remain vigilant and proactive. "We advise all prospective passengers to monitor the latest information from their respective airlines regarding flight status and the options available to them, whether it be a refund or a reschedule," he concluded.

As the ash continues to fall, the Indonesian aviation industry remains in a state of "wait and see," prioritizing the invisible but deadly threat of volcanic ash over the pressures of a busy Sunday schedule. The recovery of the flight network will likely take several days once the "all-clear" is given, as airlines struggle to reposition aircraft and crews across the sprawling archipelago.