There have been many more!

If you are looking for effect on airliner ops, lots.

They now stay away from the plumes and that is an effect.

An encounter is something to be avoided.

John





Robert Moore wrote:
jimp

In your research, how many volcanoes did you find that had any effect
on aviation in the past 50 years?


Well....I've done no research, but I know of at least one.

A B-747 flying in the South Pacific area had all four engines
flame-out due to volcanic ash. Once out of the cloud, the crew
was able to restart the engines. ATC routed traffic around that
area for some time.

Bob Moore
ATP B-727, B-707
Pan Am (retired)