In addition to balancing the salt content of the body and filtering various liquids into urine, kidneys can also help with blood pressure. Over time, they can compensate for low blood pressure by adding fluid to the circulatory system, however this is only a temporary fix, and properly circulating blood in clean arteries is the only real solution. The kidney is quite a hard-working organ. It also plays a role in secreting hormones, reabsorbing nutrients, and filters about 180 litres of liquid a day (of which, only about 2 litres become urine).
These days, most commercial planes are 'fly-by-wire'. That is to say, the control wheel (or 'yoke') is not directly attached to any piece of control machinery. Instead, inputs are connected to a computer, and the plane decides if the command would be safe before executing it. This way, modern planes cannot be stalled nor flipped by careless pilots (though they can still be flown into mountains).
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