Thanks! Also, Rotterdam and The Hague, the biggest cities after Amsterdam, are missing from the airport map.
On a different note, you probably intended airports to only cover cities inside their own countries, but for some airports this does not make sense, like Maastricht-Aachen or Basel-Mulhouse-Freiburg and arguably also not for some other cities close to borders like Genève, Malmö, Innsbruck and Bratislava. I'm not sure how it is along the US-Canada border but in Europe it's very common to hop over the border and take a plane from a neighbouring country.