BAA reveals 20% of Heathrow flights delayed in 2011

More than a fifth of flights departing from Heathrow Airport were delayed last year, operator BAA said today, although this was an improvement on snow-hit 2010.

BAA said 21% of flights left Heathrow 15 minutes or longer after the scheduled departure time in 2011, although this was better than 29% the previous year, which was hit by volcanic ash and severe winter weather.