New London airport plan shelved
It's a scheme which has become known, and in some quarters, derided, as Boris Island.
London mayor Boris Johnson was a big fan of a plan to build a new four-runway airport to the east of the capital, in the Thames Estuary.
But an official body investigating how to increase Britain's airport capacity has grounded the idea.
A "network of competing airports" is now the preferred solution.
That could mean expanding Heathrow to the west of London, or Gatwick to the south.
Other cities around the world face a similar dilemma.
We discuss that dilemma with Rob Gray, co-ordinator of the Back Heathrow campaign - which supports expansion at Heathrow - and John Stewart, chair of a lobby group called Airport Watch, which is opposed to what it calls "unsustainable" aviation expansion.