AGARTALA, Jan 17 (TIWN): Flight delays continue to haunt passengers due to fog. The problem recently started, and Indigo officials said that "fog" is the only reason for all these hassles. The passengers of 6E491 received messages in morning that due to 6E966's delay, this flight may be affected which resulted 1 hour 45 minutes delay. The passengers at Agartala MBB Airport are still worried about the exact timing of departure. Many passengers have flights in afternoon from Kolkata whereas many have train schedules there. State Tripura has been experiencing extreme weather and low visibility due to fog since the morning. The state has seen almost nil sunny hours in the last 1 week. All these are affecting the flight schedules.