If someone use the Hitler card, this person shows he has lost the discussion it is said - sorry Sir Terry.
You can blame the nazis for monstrous many awful things, but if you look at what they did to their infrastructure before the war, some of this plays an important part of the German infrastructure of today. Large parts of today's German motorway stucture is based on what was started in 1925 under the Weimar Government and further refined under the nazis after 1933. The nazis said they needed these Reichsautobahns to move men and material, but they never played a vital role in the war effort something Speer concluded with, after Todt died in February 1942, and stopped at 2,400 miles of them.
To bring this back to London and its airports. Except for London City Airport, all of today's airports played a vital role during the Second World War as RAF airfields. After the war this was a vital advantage and head start for Britain and London. Today these airports are major restraints for a futher development of Britain's aviation industry and for London to play a vital part in the world economy in the future. The only conclusion for me is to find one location for one London airport that can be used for the next 60 years - an airport that can play a vital role in uniting Britain.