system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How do planes not become covered in ice when flying in -70F temperatures?
gpt
Planes try to avoid flying into areas that contain high amounts of moisture like clouds.  When that isn't possible there are de-icing systems on the plane that prevent the buildup of ice around critical areas like the engine inlets and leading edges of wings and probes.  They work by heating up or by passing bleed air from the engines underneath the surface or an electric heater.  This is the reason why the leading edges of engine intakes on most planes aren't painted.