The Times of India. The Ministry of Civil Aviation on Friday night issued a passenger facilitation advisory to airlines amid widespread disruption to flight operations caused by dense fog and low visibility,. Ranchi: Six IndiGo flights 6E 7059/7014 (Kolkata-Ranchi-Kolkata), 6E 7674/7235 (Kolkata-Ranchi-Kolkata) and 6E 7561/7562 (Kolkata-Ranchi-Kolkata) were cancelled, while 15 others were delayed due.