Volcanic ash disrupts Jakarta flights as Anak Krakatau erupts

A packed bag and a boarding pass were not enough for thousands of travellers in Indonesia on Sunday.

Ash from Anak Krakatau disrupted flights at Jakarta's Soekarno-Hatta International Airport and other airports. AP reported cancellations and widespread passenger disruption as ash drifted across western Indonesia. AP's report on the disruption.

The eruption was out in the Sunda Strait, but its effects were not staying neatly around the island. That is the problem with airborne ash: it follows conditions in the atmosphere, rather than the lines on a travel itinerary.

What the authorities reported

Indonesia's disaster agency, BNPB, said its Sunday morning update recorded temporary closures at four airports: Soekarno-Hatta, Halim Perdanakusuma, Radin Inten II and Budiarto. It described the closures as aviation-safety measures and stressed that operating status could change with the ash distribution and monitoring results. BNPB's airport update.

Those details were a snapshot, not a promise that every airport would reopen at a fixed time. A closure window in an early update should not be treated as a confirmed boarding time later in the day.

Why the air above the airport matters

Weather and geophysics agency BMKG said it had intensified round-the-clock monitoring of the eruption's effects on the atmosphere, aviation and nearby waters. Its Sunday satellite analysis identified ash across areas including Banten, Jakarta, West Java and Bengkulu.

BMKG also described issuing aviation-weather warnings, known as SIGMETs, and tracking ash at different heights and in different directions. In other words, checking only the view from the terminal window would not tell the whole story. BMKG's monitoring report.

Flight decisions depend on conditions along the route as well as at the runway. That makes official updates more useful than guessing from a photograph of clear-looking ground.

For travellers, the next update is the important one

BNPB urged passengers to check the latest information from airport operators and aviation authorities before travelling. Airline updates are also essential for the status of an individual booking.

A dramatic clip can show that an eruption happened. It cannot reliably tell someone whether a particular flight is operating now. The airport, route and time all matter.

Sunday's disruption was a reminder that a natural event does not have to happen beside a terminal to stop its departures. The useful response is to follow verified operational information as it changes, rather than letting an old closure notice make the next travel decision.