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Dog-faced pony soldier
Join Date: Feb 2004
Location: A Rock Surrounded by a Whole lot of Water
Posts: 34,187
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Sea level is very inefficient fuel-wise. It can be done but range will suffer a lot versus "at altitude" (iirc jet engines are usually optimized for FL360).
If an aircraft is slowed enough and proper techniques employed it's possible to ditch in water (Sullenburger, Hudson River). A steep descent into water at cruise or cruise-descent speed would be a guaranteed fatal outcome for everyone on board.
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A car, a 911, a motorbike and a few surfboards
Black Cars Matter
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