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Why do aircraft tend to stall when they get very high upward vertically? (Especially combat aircraft moving upward like a rocket)
Aircraft rely on Bernoulli's Principle to fly and create lift. When they get too high and the air gets too thin, or when the angle of their wings is too steep, not enough air is flowing over the wings to create lift. As a result, the aircraft stalls. This is not a problem for rockets becuase they do not rely on lift to reach their maximum altitude, but instead rely on thrust.