You do talk some rubbish dave59. Nothing now stops airlines expanding in the regions.
Heathrow serves one of 5 global cities. I work in the airline industry that airlines fly empty planes to New York, Barcelona, Madrid, Istanbul, Dubai etc is a myth which people wish to believe.
British Airways is one of the most profitable airlines in the world and they don't do that by flying half empty aircraft out of Heathrow.
You are relying on history to shore up your argument. If American Airlines or any other airline want to fly profitable services out of Manchester, Cardiff, Humberside or Birmingham there is nothing stopping them.