This isn’t (yet) a question about Heathrow.
Nantes Atlantique Airport (NTE), or Aéroport Nantes Atlantique, is the largest airport in the west of France. It was originally a military airfield before WWII, and was called Aéroport Château Bougon – the nearest city is Nantes, five miles away, and the airport itself is in Bouguenais. The airport’s official capacity is three million passengers a year and in 2011 saw 3,246,226 passengers.
Cheap air travel and millions of air passengers per year cannot continue for much longer. Oil is a finite resource, and it takes a lot of crude oil to produce jet fuel for moden planes. Building big new airports on the presumption that the numbers for travel by air will go on and on increasing is a short-sighted folly.