– 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
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