The solution for Heathrow and the South East is simple do what the airlines want and the business will follow.
That's all very well xtypeman, but there are other priorities for London and the South East besides what benefits the airlines and airline business. However important air travel is to the economy it is still only a small part of it and there are many other interests to be considered and served. I would expect the Mayor and other public representatives to look for a balance between all these interests.