CHANDIGARH: Air and rail connectivity was badly affected due to fog on Thursday. Seven flights were delayed and eight to Bangalore, Delhi, and Mumbai were cancelled. Three trains -- Kalka Shatabdi, Kalka-Howrah Express, and Unchahar Express (between Chandigarh and Allahabad) were delayed by a few minutes, five hours, and nine hours respectively. Airport officials said the affected flights included Jet Airways, Go Air, SpiceJet and Indigo. The Himalayan Queen is also running an hour behind schedule. Flights and trains are being affected due to fog and low visibility since the past four days.