system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: what makes an airplane "lightning proof?"
gpt
Airplanes are almost all metal on the outside.  They are hit by lightning all the time, but the current flows around the plane's skin and down to the ground.  Some systems kick off, but the pilots switch them on again and make a note in the logbook for maintenance to check for damage.  No big deal, but not "lightning proof".