Airports aren't just about exhausting queues, enraging delays and the perils of lost luggage. They are the 24-hour backdrop to emotional reunions, and tear-tinged goodbyes, with the hustle and bustle of people on the move hiding a host of human stories. Now, in a touching new series for Sky1, Kate Thornton meets the everyday people whose heartache and joy is played out at the check-in desks and departure gates of the UK's busiest airport.