Indonesia is facing a major aviation disruption as volcanic activity across the archipelago continues to affect airports, airspace and commercial flight operations.
The most severe recent impact has come from Anak Krakatau, where explosive activity generated large ash clouds and forced authorities to impose restrictions on surrounding airspace. The eruption affected both domestic and international routes, creating widespread delays, cancellations and aircraft diversions.
Volcanic ash is one of the most serious hazards to commercial aviation. Fine ash particles can damage aircraft engines, reduce visibility, contaminate airport infrastructure and make flight operations unsafe even when an eruption occurs hundreds of kilometres away.
The disruption has not been limited to one volcano.
Indonesia currently has several volcanoes showing elevated activity, including Anak Krakatau, Semeru, Merapi, Lewotobi Laki-laki, Sinabung, Mount Ibu and Ili Lewotolok. Activity across these volcanic systems has increased pressure on the country’s aviation network and highlighted the complexity of maintaining safe flight corridors in one of the world’s most volcanically active regions.
Some airports have faced temporary closure or operational restrictions due to volcanic ash, while airlines have been forced to reroute aircraft around hazardous zones. These changes have affected passenger schedules, aircraft rotations and regional connectivity.
The consequences extend beyond domestic travel.
Indonesia sits at the center of important international flight routes connecting Southeast Asia with Australia, East Asia, the Middle East and Europe. Any major disruption in Indonesian airspace can quickly affect international airline networks, especially when key airports or heavily used flight corridors are impacted.
The aviation sector is particularly vulnerable because volcanic ash clouds can move rapidly and change direction depending on weather conditions. This creates a dynamic risk environment in which airlines, air traffic controllers and airport operators must continuously adjust operations.
The economic implications are also significant.
Airlines face higher operational costs from diversions, cancellations and repositioning aircraft. Airports can experience reduced traffic, while tourism, business travel and air cargo may also be affected.
For Indonesia, this is not only a natural-disaster issue. It is also an infrastructure, aviation, tourism and economic resilience issue.
Indonesia has more than 100 active volcanoes and lies along the Pacific Ring of Fire, making volcanic disruption a recurring structural risk. The current wave of activity highlights the importance of early-warning systems, volcanic ash monitoring, resilient airport operations and stronger coordination between geological agencies, meteorological services and aviation authorities.
For NEXUS PROJECT, the broader lesson is clear: countries with high natural-disaster exposure must increasingly integrate disaster resilience into transport infrastructure, economic planning and national risk management.
As global aviation networks become more interconnected, local geological events can quickly create regional and international economic consequences.