An elevation of about 20,000 feet above sea level is the maximum height at which sufficient oxygen exists in the air to sustain us.
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Surviving a Plane CrashThe first concern of a crash over the open ocean is, of course, surviving the plane crash itself. And the odds of surviving are surprisingly good. More than 95 percent of the airplane passengers involved in an airplane crash survive, according to the National Transportation Safety Board (NTSB).