system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What would happen to airplanes during a massive power outage?

Assuming all the planes themselves didn't lose power, just a massive power outage on the ground. Could most planes safely land?
gpt
Major airports have backup generators that would power them long enough for the planes to land.

Failing that, planes can always talk to each other, and negotiate who is landing where.  In fact, this is how it's done at small airports that don't have dedicated air traffic controllers.  If there weren't any more planes going out (due to the power outage), it would significantly cut down on the amount of runway and air traffic, too.