How many airports does each of those cities have? As a reference point
London has:

From what you count as London I'd say Paris has Orly, Beauvais-Tillé, Le
Bourget Charles de Gaulle, and Châlons Vatry.

Ask EasyJet or Ryan Air and you'll get a very different answer from that
you'd get from the senior managers of a global business But I
suggest you ask such managers what they think makes for a potential
regional[1] business base before you expect them to count Gatwick etc in
thr mix.


[1] Regional on the scale of eg Europe, Europe + Asia etc




--
Robin
reply to address is (meant to be) valid