Manchester is Manchester, Birmingham is Birmingham etc. to foreigners, it is clearly defined in the name.
Confusion can arise when an airport like 'Kent International' or 'Durham Tees' comes up, where the fock is Kent and where the fock is Tees a foreigner may well ask.
Ryanair have not helped the travellers geographical knowledge one iota, since when has Hahn been anywhere close to Frankfurt, it is closer to Cologne & Luxembourg than it is to FRA and that is just the tip of that iceberg.