Beijing?s Capital International Airport has been listed as the worst for on-time departures in June, according to new flight statistics data.
Military controls of airspace and an expanding fleet added to air-traffic congestion at Beijing?s largest international airport, according to FlightStats June 2013 report.
Shanghai came in at second-worst among the world?s 35 busiest international airports, while Tokyo?s Haneda airport was the top performer with 95 percent of flights departing on schedule, the Japan Times reported.
Of the 22,019 flights leaving Beijing, only 18 percent were on-time, while Shanghai?s Pudong International airport had a rate of approximately 29 percent.
Amsterdam?s Schipol airport came in third place, with an on-time departure rate of 84 percent, while John F. Kennedy International Airport in New York was 26th?at 66 percent and London Heathrow 21st?at 72 percent.
Singapore?s Changi Airport ranked 10th?overall with a 78 percent on-time performance.
FlightStats considers a flight delayed if the aircraft does not take off within 15 minutes of its scheduled departure time.