A third runway could allow airport to expand to 150 million passengers a year, nearly double the current scale

London's Heathrow Airport on Friday unveiled a £49-billion ($65 billion) expansion plan, including the costs of building a long-awaited third runway, approved by the UK government after years of legal wrangling.

London-Heathrow Airport has unveiled its own plans for a third runway following a rival submission from billionaire Surinder Arora