In the National Capital, schedule of around 50 domestic and international flights at the IGI Airport was affected due to thick fog on Thursday. Air operations were suspended for about three hours and several flights were cancelled. <br/> <br/>According to airport officials, over 20 flights were delayed by up to two to three hours, while as many, were diverted to Jaipur, Ahmedabad, Mumbai, Kolkata and Bhopal as runway visibility dropped to less than 50 metres last night and early Thursday morning.<br/>