Travellers wait outside a terminal at Gatwick airport in south England
Travellers wait outside a terminal at Gatwick airport in south England December 1, 2010. Heavy snow grounded all flights at Gatwick airport on Wednesday, while the worst early winter weather in almost two decades also caused severe delays on roads and rail lines up and down Britain. REUTERS/Toby Melville (BRITAIN - Tags: ENVIRONMENT SOCIETY IMAGES OF THE DAY)