Generally it means an area that (usually) a government will not allow unauthorized aircraft to fly into, for example, area 51 is a no fly zone, meaning, if you get near it, the US airforce will dispatch interceptors to tail you, you will be hailed on the radio, and told to turn back. If you don’t, they *can* use force to stop your aircraft, so if you ignored the warnings and kept flying into the zone, the fighters dispatched to tail you, can fire at you to stop your plane from going any further
Another no fly zone would be something like a nations borders, for example a military aircraft from Russia, is not allowed to fly over US airspace, if the Russian plane kept going, the US would be well within its rights to shoot it out of the sky
And the last type of zone is usually warzones, these places are “hot” with combat, and sometimes you won’t even get a warning before one side fires at you
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