Anak Krakatau disrupts Jakarta flights

What's happened

Anak Krakatau has erupted since late Friday, producing lava fountains and ash plumes up to 50,000ft and forcing temporary closures at Soekarno‑Hatta and multiple regional airports. Authorities have suspended operations at several airports, delayed or cancelled hundreds of flights and stranded tens to hundreds of thousands of passengers while marine and air exclusion zones remain in place.

What's behind the headline?

What is happening now

• Anak Krakatau is producing repeated eruptions that are generating high ash columns and lava fountains. Ash has reached altitudes reported between 20,000ft and 50,000ft, which carries particles into air routes serving western Java and parts of Sumatra.

Why airports are shutting

• Volcanic ash will damage jet engines and cockpit windscreens and will clog aircraft systems. Authorities are prioritising safety by suspending operations when "paper tests" and satellite imagery confirm ash in an airport's airspace.

Immediate consequences

• Airlines will face cascading operational disruption: cancelled rotations, aircraft and crew positioning issues, and delayed recovery of schedules. Airports will need time to clear aprons and runways of ash and to reassemble displaced flights.

Medium-term outlook

• The eruption will keep aviation disruption likely while ash clouds continue. Authorities will maintain exclusion zones at sea and no‑approach rules for vessels; those rules will constrain local shipping and fishing.

Forecast

• Monitoring data indicate continued eruptive activity; the transport network will remain fragile until ash dispersal patterns stabilise and volcanology agencies record a sustained decline in activity. Airlines will prioritise restoring high‑demand international routes first, but restoring full domestic connectivity will take several days.

What to watch next

• Changes in the volcano alert level, fresh satellite ash-detection reports, and official notices from Soekarno‑Hatta and the transportation ministry. Large ash plumes or a change in eruptive style will force further closures and cause wider transport disruption.

How we got here

Anak Krakatau has been intermittently active since it emerged in the 20th century inside Krakatau's 1883 caldera. The volcano produced a deadly tsunami in 2018 after a partial flank collapse. Indonesian agencies monitor ash plumes, seismicity and enforce a 3km exclusion zone around the island.

Our analysis

The coverage is consistent on the core facts but differs in scale and passenger figures. The Guardian and AP reported the initial suspension and cited the transport ministry saying roughly 1,558 delayed flights and 170,000 passengers were affected (The Guardian: "To date, 1,558 flights have been delayed at the eight affected airports, with 170,000 passengers stranded"). Other outlets reported lower near-term tallies: BBC Business and France 24 gave figures around 209 flights and more than 22,000 passengers affected on Sunday (BBC Business: "More than 22,000 people have been impacted by the suspension"; France 24: "More than 22,000 passengers have been impacted"). Reporting on operational responses varies. Arab News and an early New York Post update emphasised that by Tuesday Soekarno‑Hatta and four other airports had resumed operations (Arab News: "the airport serving the capital Jakarta and four others ... are now operating again"). France 24 noted attempts at mitigation, including a BNPB plan to promote rain through weather modification: "BNPB said it would conduct a weather modification operation...to promote rain". The Darwin Volcanic Ash Advisory Centre and Indonesia's volcanology agency were consistently cited for ash heights (New York Post cited plumes to 50,000ft; Independent and AP repeated 20,000–50,000ft ranges). The reports also repeat safety warnings and exclusion zones. The Guardian and France 24 quoted geology agency head Lana Saria warning against approaching Anak Krakatau and saying current activity did not indicate an imminent tsunami (France 24: "Lana warned against approaching Anak Krakatau...she said the most recent series of eruptions do not have the potential to trigger a tsunami at this time"). The 2018 tsunami and its death toll appear across outlets as the key historical context (Independent: "A 2018 tsunami ... killed at least 430 people"). Direct quotes used in source coverage include transport officials stressing safety: Lukman F. Laisa said "Safety remains our top priority in

Go deeper

• How long will airlines take to restore cancelled domestic and international routes?
• Will authorities change the exclusion zone or the volcano alert level this week?
• What monitoring data will confirm that ash no longer threatens flight operations?

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