<br/>Flight operations at the IGI airport in New Delhi remained suspended Tuesday morning due to dense fog which has disrupted the schedule of over 50 domestic and international flights. No flight has taken-off or landed after 8 am as the runway visibility dropped to 50 metres. Sources said, about 12 incoming and outgoing morning flights have been cancelled.<br/><br/>Thick fog over parts of North India badly disrupted train services as well with railways cancelling seven trains and more than 100 running behind schedule.<br/><br/>14 trains were rescheduled including the Amritsar, Bhopal and Lucknow Shatabdis.<br/>