Alaska Airlines said Monday that 41 flights have been canceled after the Pavlof Volcano on Alaska’s Aleutian Islands erupted Sunday, sending ash 20,000 feet into the air. The airliner said that the canceled flights affected 3,300 passengers.

The Seattle-based airliner reportedly said that the canceled flights involved six Alaska cities. The flights will remain canceled until the airline can evaluate weather reports after daylight Tuesday.

Flights to Barrow, Bethel, Kotzebue, Nome and Deadhorse also are canceled, Fox News reported.

The U.S. Geological Survey said in a news release late Monday that the activity level of the volcano has "declined significantly." The volcano has had 40 eruptions so far and it is “one of the most consistently active volcanoes in the Aleutian arc,” according to the USGS. 

The Pavlof Volcano is about 4.4 miles in diameter and its previous eruption in 2013 sent ash plumes as high as 27,000 feet.