Editor’s Note: Sign up for Unlocking the World, CNN Travel’s weekly newsletter. Get the latest news in aviation, food and drink, where to stay and other travel developments. CNN  —  Andrea Rubakovic was stranded at London Heathrow Airport and feeling increasingly panicked by the prospect. It was early January 2010 and a sprinkling of snowfall had ground the UK capital to a halt. Andrea’s flight home to Toronto, Canada was canceled, as was pretty much every flight on the Heathrow departures board. “Just complete system breakdown, absolute mayhem at the airport,” is how Andrea remembers Heathrow that day. As a Canadian, Andrea was baffled by the idea that the UK…