In aerodynamic terms, Coffin Corner is referred to the region of a flight envelope where the aircraft's critical Mach number and stall speed are within a few knots of each other. In other words, the region (or speed) where any greater speed will cause flow separation over the wings and lose lift and any lower speed will stall the airplane and lose altitude. In both cases, the aircraft will fall out of the sky, with minimum or no control.
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