<h1>Volcanic ash plumes disrupt flights; airlines cancel services, perform inspections and follow regulator advisories on routing and reporting.</h1> Volcanic ash plumes from the Hayli Gubbi eruption disrupted flight operations, prompting cancellations, delays, aircraft precautionary inspections, NOTAM issuance, and coordination among aviation stakeholders. The regulator directed airlines to avoid published ash affected areas and flight levels, adjust flight planning and fuel, immediately report suspected ash encounters including engine anomalies or cabin smoke/odour, and required airport operators to inspect and remediate contaminated runways, taxiways and aprons before resuming movements.