Each year millions of passengers fly over volcanically active regions such as Iceland and the North Pacific.
Although there haven’t been fatal crashes due to ash clouds, a number of aircraft have flown into ash clouds over the years, resulting in a few near-fatal incidents.
On the heels of the world's largest active volcano Mauna Loa in Hawaii erupting for the first time in four decades, CNN provides an explainer as to why volcanic ash clouds can endanger aircraft.
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