So far, no one has mentioned that expansion at Stansted has also been announced in October 2024, on top the expansion discussed in this thread:
More than 5,000 jobs will be created as a result of a 5-year, £1.1 billion investment in London Stansted Airport, welcomed today (14 October 2024) by Chancellor Rachel Reeves and Transport Secretary Louise Haigh.
The plans were unveiled by the Prime Minister at the flagship International Investment Summit in London and will see Stansted unlock the potential of its runway through the extension of its existing terminal.
The funding will expand the existing terminal by a third, securing new air routes to key business and holiday destinations – boosting local supply chains and further cementing the UK’s place on the international stage.
The investment consists of £600 million for the terminal extension, alongside another £500 million to improve the existing terminal and wider airport estate.
Funding will expand Stansted Airport terminal by one-third, helping to support UK businesses and the aviation sector.
www.gov.uk
Additionally, the cap at City is being raised, see this thread:
https://www.railforums.co.uk/threads/london-city-airport-expansion.272734/
That might work if those rail services served Heathrow direct - otherwise the hub element is lost.
The rail industry's "solution" is Old Oak Common, and it seems like that's the best they're going to get.
Well the Saudis are rumoured to be wanting to start a major airline to rival Emirates and the like, and part of that would supposedly see significant investment in Heathrow.
A bit more than rumoured, they have placed orders with Airbus and Boeing for aircraft.
As I said, I’ll bet one shiny pound that there isn’t a single route from Heathrow that is wholly or partly dependent on cheapo connecting passenger fares to make it break even.
Would Manchester-Heathrow make a profit without connecting passengers? Remember that the FlyBe's second attempt failed due to woefully low usage on many of their shuttle routes, as they had no connecting routes out of Heathrow. What killed of FlyBe in 2022, wasn't lack of aircraft as they claimed it was, it was competition from the railway on routes like London-Leeds/Bradford.
No airport will relieve congestion at LHR, the only way to relieve congestion there is to expand. There are plenty of large airports in the U.K. that could comfortably host the extra capacity without any investment whatsoever, but the airlines are not interested.
I live in the North and since 2021, have taken all of my flights from London, as Manchester didn't serve my destination. I'm sure Manchester and Birmingham having more short haul and also long haul routes (Emirates have multiple daily services from both to Dubai) could help London Airport, I for one, would switch back to flying from the North, as I'm sure many others would, if this was the case. Other alternatives include limiting short haul flights, such as to Manchester and closer European destinations and of course building HS2 in full to make these short flights irrelevant (except for connections) and boost more Eurostar services.