Reason and duration irrelevant. A sign could be that all flights are cancelled, diverted, and delayed across the state, but likely there will be an announcement due to weather/ war/ instability/ etc. Only states with two or more international airports count, otherwise this trivial.
Resolves YES if every one of a US state's international airports are shut down at the same time, beyond regular hours. Nightly closures don't count. Smaller private and business airports don't count.
Resolves NO otherwise after close.
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@mariopasquato Nebraska, Arkansas, Delaware, Idaho, South Dakota and West Virginia ; I believe.
@SirCryptomind Given that applying the universal quantifier on the empty set yields true then these states already shut down all their international airports. But I see you are asking that there are at least two airports…