The eruption of the Bogoslof Volcano continues to affect air travel.
It began on Sunday, causing the highest level of aviation alert to be issued.
The force of the fifty-minute eruption caused smoke and debris to go as high as 45,000 feet into the air.
Bogoslof Island is located in the Aleutian Islands, of Alaska.
Many flights between North American and Asia take a route that puts them over the islands.
Ash clouds can be extremely detrimental to aircraft and often cause lightning storms.
The volcano last erupted in 1992, but over the past two years, lava flows had tripled the size of the island.