Air traffic in Europe is increasing steadily every year - and is predicted to reach 18 million flights per year by 2020: · Already there are up to 3,000 planes in the air at any one time, and there are more than 30,000 flights a day on peak days. In summer 2006, approximately 2.5 million people – the population of Manchester or the combined populations of Málaga and Munich – is expected to fly each...