When flying abroad to Europe if you fly into big airport hubs first instead of to your final destination you can save a lot of money. So instead of flying into a small city airport you can fly into a big hub airport
Couple examples of big hun airports are •London Heathrow Airport, LHR
•Paris Charles de Gaulle Airport, CDG
•Amsterdam Airport Schiphol, AMS
So flying into those airports and then catching a flight from there to your final destination can save you hundreds of dollars in flights. Also flying out of airport hubs for me LAX in Los Angeles is the closest airport hub.