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Planes CAN fly lower over water, as water is flat. There are less things to collide with.

But usually they DON'T fly lower over water - unless they need to for some other reason, like spotting ships, oil spills or something.

At low altitude, the air is thicker and cause more drag, which increases fuel consumption. For longer hauls it's better to be up where air is thinner and easier to travel through.

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8y ago

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