List of busiest passenger air routes

Columns: Rank | City 1 | City 2 | Passengers ( 2016 )
1 | London | Dublin | 4,771,614 | 2 | London | Amsterdam | 4,344,935 | 3 | London | New York | 4,243,687 | 4 | London | Dubai | 3,960,389 | 5 | Moscow | Saint Petersburg | 3,836,588 | 6 | London | Edinburgh | 3,393,013 | 7 | Paris | Toulouse | 3,260,074 | 8 | London | Barcelona | 3,125,080 | 9 | Berlin | Cologne + Düsseldorf | 3,017,845 | 10 | Paris | Nice | 2,975,405

Example questions:
What is the former name of the second city for the only passenger route based out of Russia by Regional statistics for Europe ? | What county is the second city in the 6th busiest passenger route by Regional statistics for Europe , located ? | On what body of water does the first city for the busiest passenger route by Regional statistics for Europe , stand on ? | Where is the second city in the 4th busies passenger route by Regional statistics for Europe , located ? | In what province is the second city for the busiest passenger route by Regional statistics for Europe , located ?

Answers:
Leningrad | Midlothian | River Thames | United Arab Emirates | Leinster