>>> won't be easy, but the mayor of london wants to buy heathrow airport a, build upwards of 100,000 homes on the site and then move heathrow to a different location outside the city of london . heathrow is the size of 35 disney lands. it's the busiest airport in europe by far and near the top of the list worldwide. because heathrow needs more run twice grow, mayor boris johnson says now is the time to get this right. he says it needs to close due to noise, congestion and pollution.