There are a few reasons why planes avoid flying over the Pacific Ocean. The most common reason is that there are no airstrips or airports on many of the small islands, so if a plane had to make an emergency landing, it would be difficult to find a place to land.
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Why Planes Don't Fly Over the Pacific Ocean
Why do airplanes avoid flying over the Pacific Ocean when travelling from America to Europe/Australia? - Quora
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Why Do Planes Avoid Pacific Ocean, Bitlux, Global Private Jet Charter
Why do planes not fly over the Pacific Ocean? - Stratos Jet Charters, Inc.