First “Air traffic control” won’t just “go down”.
Air traffic control is a massively redundant system that isn’t just at one location. Any sort of disaster that took it all out would almost certainly take out all the planes too, if not destroy the airports themselves.
A single airport’s control tower might be affected by an outage of some sort such as a tsunami or earthquake, in which case all the planes using that airport could be rerouted to other airports that could accommodate them and that were not in the danger zone. Other airports and their control towers and systems would fill the gap.
In worst case scenarios, some could make emergency landings (like in the movie Sully when a pilot safely ditched a passenger jet in the middle of the Hudson river).
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