"Is the extra runway more political than logical?"
It is logical for a politician to listen to the people who elect him - no?
It has ALWAYS been about politics - the original Roskill Report was canned because the good people of Bedfordshire etc put up a stink, then Foulness went through the roof then.........
Airports are like Energy supplies - we all want them , we want them cheap and we want them easy to use
BUT THEY CAN'T BE ANYWHERE NEAR US