Continuing through my misconceptions dispelled since I started studying aviation… An airplane is doomed if its engine fails.
My policy was previously to not board aircraft with less than two engines. However, when unpowered, most aircraft can glide at a fairly flat glide ratio and execute a normal landing given a suitable landing area is within gliding range. A small plane has a glide ratio of about 10:1 and a jet airliner about 15:1. Even the space shuttle, with a glide ratio of only 4:1 gets on the ground in one piece without ever using engines.
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