– Airspace is not closed in a matter of minutes,l especially not when dozens of countries are involved.
– In the most extreme case (which will hopefully never happen again (looking at the US and looking at Russia)) the aircraft can be intercepted and shot down.
– In other cases a civilian aircraft must submit a flight plan for the entire flight. That flight plan must be approved by all authorities involved, which in peace time is usually not a problem. In the case of a closed airspace the flight plan will not be approved and the pilot know that they cannot reach their destination. Hence they will not fly, as this would easily mean legel consequences and removal of their flight license.
*And pilots really like their flight licenses*.
SYL
It depends, the least that will happen is ATC will tell the pilot to call a number as soon as he lands so the FAA (or whatever entity is in charge of that country’s airspace) can figure out what happened and how to prevent it in the future. The worst that could happen is [KAL flight 007](https://en.wikipedia.org/wiki/Korean_Air_Lines_Flight_007)
The notices, called NOTAMs (notice to air men) are published with an effective date. That’s not in the past. Airlines have to have time to get their planes back. So the airspace was closed today, probably effective in a couple days. Even at 9/11, planes in flight were allowed to reach their final destination.
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