Persistent bad weather in the northern region of Pakistan is continuing to affect the PIA flights schedule in Islamabad and Lahore resulting in delays which is beyond the control of the airline.According to the PIA spokesman, on Friday, six international flights and 3 domestic flights were affected due to weather. The international flights, were PK 892 Islamabad-Lahore-Bangkok-Hong Kong, PK 763 Islamabad-Amsterdam-Frankfurt, PK 781 Islamabad-Toronto, PK 749 Islamabad-Milan, PK 701 Islamabad-Manchester and PK 794 Barcelona-Islamabad-Karachi. Three domestic flights that were delayed due to weather were PK 301 Islamabad-Karachi, PK 329 Islamabad-Quetta and PK 651 Islamabad –Lahore. PK 451 & PK 452 Islamabad-Skardu-Islamabad were cancelled due to poor weather conditions.Besides, both Karachi and Islamabad airports remained close for two hours due to cleaning of the runways.