A huge winter storm slams into Toronto International Airport. The Airfield Inspector unit urgently tracks down a blown-over sign before it becomes a hazard. The airport is down to one runway as snow ploughs clear the other. They have 15 minutes before snow makes the live runway unsafe. A jack-knifed Boeing 787 throws operations into chaos. Watch Toronto Airport Uncovered, Thursdays at 8pm, on National Geographic UK | National Geographic UK

Take a 360 degree tour of Doha's state-of-the-art Hamad International Airport, our home in Qatar. | Qatar Airways