Karachi (Afzal Nadeem Dogar) Even after 13 days have passed since the problem of the air traffic system in the United Kingdom, the backlock of flights continues. From September 8 to 20, UK affected flights have exceeded 39,000. According to the flight schedule, Heathrow, Gatwick, Manchester, Stansted and Luton airports are the most affected. According to airport data, more than 2,300 flights from Heathrow, Gatwick, Manchester, Stansted, Edinburgh, Birmingham, Bristol, Glasgow, Luton, City, Newcastle, Liverpool, East Midlands, Aberdeen and other airports were affected by 8pm on Sunday. As of September 19, 36,700 flights had been affected. According to aviation experts, it may take several more days to restore flight operations.