 The environmental impact of aviation in the United Kingdom is increasing due to the increasing demand for air travel in the country . In the past 25 years the UK air transport industry has seen sustained growth , and the demand for passenger air travel in particular is forecast to increase more than twofold , to 465 million passengers , by 2030 . Two airports ; London Heathrow Airport and London Gatwick Airport , are amongst the top ten busiest airports in the world for international passenger traffic . Whilst more than half of all passengers travelling by air in the UK currently travel via the five London area airports , regional airports have experienced the most growth in recent years , due to the success of ' no @-@ frills ' airlines over the last decade . 
