answer:The problem with altitude, as far as the Macbook Air is concerned, is one of cooling. As air density decreases with altitude, the air becomes less effective at drawing heat away from the heat sink, and the processor can overheat. This is less of a problem at lower temperatures. Some computers have more robust cooling systems than the Air, and so can handle higher altitudes. There is apparently also a problem, though, with mechanical hard drives; at low air pressure, the head can’t properly float above the rapidly spinning disc, and it can crash. Solid-state drives, like in your Air, don’t have this problem.