The Civil Aviation Authority of the Philippines on Friday, Oct. 30, issued a flight safety advisory after Mayon's eruption.
CAAP said the notice to airmen covers flights near the volcano "with vertical limits extending from the surface up to 19,000 feet."
It said the NOTAM is in effect from 1:27 p.m. of Oct. 30 to 11:53 a.m. of Oct. 31.
Due to the volcano's eruption that started at 11:53 a.m., PHIVOLCS raised Mayon's alert level to 3.
A grayish plume that rose 3000 meters was initially monitored during the event.
