Volcanic ash can damage aircraft engines and reduce visibility, leading to flight cancellations.
Indonesia has about 130 active volcanoes, many located along the Pacific Ring of Fire.
The recent eruptions were smaller than the historic 1883 Krakatoa disaster, but still required caution.
Airlines are checking the airworthiness of planes before they take off again.
The ash made flying unsafe, grounding nearly 180 aircraft and affecting over 340,000 passengers.
Strong winds later dispersed the ash, allowing Soekarno‑Hatta Airport to resume operations and several smaller airports to reopen.
Authorities continue to monitor the volcano for further activity, as it sits on the Pacific Ring of Fire, a tectonic plate boundary with frequent eruptions.
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