<h1>Volcanic ash plumes: airlines told to avoid affected airspace, report encounters, and airports must inspect and clean surfaces.</h1> A regulatory advisory in response to volcanic ash directs airlines to avoid published ash affected areas and flight levels, adjust flight planning, routing and fuel considerations, continuously monitor satellite and meteorological data, and immediately report any suspected ash encounters. Airport operators must inspect runways, taxiways and aprons for contamination, restrict operations where necessary, and complete cleaning procedures before resuming movements.