 It is the busiest airport by far in Ireland with 27.9 million passengers in 2016, making it the 15th busiest airport in Europe with flights to other airports in Ireland, Europe, North America, Africa and the Middle East.The Dublin - London flight route (London city, Gatwick, Heathrow, Luton, Stansted and Southend) is the single biggest route in all of Europe and the 2nd biggest route in the world.The route from London Heathrow to Dublin Airport is the 15th busiest route in Europe.