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.

EU -> /Stralor/will-any-eu-country-shut-down-all-o