What Happens If A Passenger Plane Keeps Flying Up?

As one climbs into the atmosphere, the air gets thinner. On the one hand, a thinner atmosphere is excellent for aircraft from the point of view that there is significantly less air resistance to the aircraft. However, the altitude at which aircraft fly is also lethal to humans, although this is overcome by pressurizing the cabin. Flying high also has the benefit of flying over any bad weather and storms that rage lower in the Earth’s atmosphere.