The idea that airports (or the transit areas of airports) are somehow extraterritorial and not part of the sovereign territory of the nation where they are loca

The idea that airports (or the transit areas of airports) are somehow extraterritorial and not part of the sovereign territory of the nation where they are located is a popularly-held belief which is entirely untrue. You'll notice that police of the host nation operate in these areas for example. For example, see https://english.elpais.com/elpais/2013/06/27/inenglish/1372357556_111094.html https://english.elpais.com/elpais/2013/06/27/inenglish/13723... but there are hundreds of sources for this if you search online.