- Routes ranked no 1, 2 and 3 includes both London Heathrow Airport, London Gatwick Airport and London Stansted Airport.
- Route ranked no 4 includes both Paris-Charles de Gaulle Airport and Orly Airport.
- Route ranked no 6 includes both London Heathrow Airport and London Gatwick Airport.
- Routes ranked no 8 and 14 includes both Frankfurt Airport and Frankfurt-Hahn Airport.
- Route ranked no 10 includes both Paris-Charles de Gaulle Airport and Beauvais-Tillé Airport (often referred to as Paris-Beauvais Airport).
- Route ranked no 12 includes both London Heathrow Airport, London Gatwick Airport and London Stansted Airport.
- Route ranked no 17 includes both Paris-Charles de Gaulle Airport, Orly Airport and Beauvais-Tillé Airport (often referred to as Paris-Beauvais Airport).
- Route ranked no 19 includes both Munich Airport and Memmingen Airport (often referred to as Munich-West Airport).
- Route ranked no 20 includes both Berlin Tegel Airport and Berlin Schönefeld Airport.
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Read more about this topic: List Of The Busiest Airports In The Nordic Countries, Busiest Intra European-Union Air Routes
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