I don't think it's unusual. The EU, for example, maintains a list of airlines banned from entering EU airspace because of safety deficiencies: https://en.wikip

I don't think it's unusual. The EU, for example, maintains a list of airlines banned from entering EU airspace because of safety deficiencies: https://en.wikipedia.org/wiki/List_of_air_carriers_banned_in_the_European_Union https://en.wikipedia.org/wiki/List_of_air_carriers_banned_in...