I disagree to a certain extent, and anyway who flies from shannon to Frankfurt and which Frankfurt is it ?
Frankfurt Hahn is probably only usefull point to point
Paris Beauvais - no idea
London Stansted - handy for Ryanair connections but could be viewed as a European hub, same as Luton.
If the issue with Heathrow is because its in the UK then services to the the 4 other 'London' airports Gatwick,Stansted, City and Luton should minimise it.
If the issue with Heathrow is because it is a world hub then a service to Paris CDG or Frankfurt Int should minimise it.
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