I'm loving this!
Can I toss in my tuppence worth from 500 miles away?
1. Part of IAG's assets are the value of its Heathrow slots. Lossmaking airlines have been bought purely for them. Building a third runway will reduce the value of their slots. No wonder they aren't keen.
2. It is extraordinarily difficult to find some way of getting those who benefit from infrastructure investment to pay for it. Even with Crossrail, where there have been developer contributions, there are thousands of individuals and organisations who will benefit without any contribution.