New beginnings at the world 's busiest airport . Airport ##s sit on artificial artificial island . Estimated $ 1 billion project is expected to take seven years . Transparent hubs covered with trees would form passenger terminals . Heathrow ` ` to close '' if not completed .
Airport ##s sit on artificial artificial island . Estimated $ 1 billion project is expected to take seven years . Transparent hubs covered with trees would form passenger terminals . Heathrow ` ` to close '' if not completed .