Mirad lo que dice Eurocontrol, que son los que organizan el tráfico a nivel europeo, no yo:
On average 16.9% of flights were delayed by air traffic flow management in the period June-August 2010. This is up from 10.6% of flights delayed in the same period in 2009. These delays increased from an average of 2.2 minutes per flight in 2009 to 4.1 minutes per flight in 2010.
As regards the primary causes of delay, as reported by airlines, 43% of all delays were attributed to airlines, 13% to airports, 28% to en-route and 2% to weather.