<br/>Air operations at the Indira Gandhi International airport remained affected due to dense fog on Wednesday, disrupting the schedules of over 50 domestic and international flights.<br/><br/>Fog started enveloping the airport from 10 pm last night and runway visibility dropped to 50 metres due to which 21 domestic and international flights were diverted while 15 others were cancelled.<br/><br/>An airport official said, some other flights to Chandigarh, Jaipur and Shimla were also cancelled. Around 10 international flights arriving Delhi were delayed.<br/><br/>Similarly, those departing also got delayed. On Tuesday, over 200 flights were affected after thick fog enveloped the airport and reduced the visibility to 50 metres.