According to the Association of European Airlines, 35.5% of flights from Heathrow were delayed by more than 15 minutes. Heathrow was more than 5% ahead of its neighbor, London's Gatwick airport, where 30.2% of flights were delayed. Next come Rome (Fiumicino, 30.1%), Dublin (28.1%), Paris (Charles de Gaulle, 27.3%). As Travel.ru notes, Heathrow topped this unenviable ranking in 2006 as well.
The list of airports with the fewest delays also remained unchanged. Brussels again took the top spot with 16.9% delays. It was followed by Düsseldorf (17.6%), Vienna (17.9%), and Oslo (19.3%).