In the national capital, due to dense fog some flights were delayed at the Indira Gandhi International Airport today morning. According to IGI officials, low visibility procedures were initiated at the airport in the wee hours after fog started setting in. They said some flights took off and landed at the airport using the CAT III Instrument landing System.The IGI Airport has augmented its round-the-clock call centre to share the latest flight information,. It can be accessed from the airport's website also.