40 flights have been delayed so far, and this could affect flight schedule for some part of the day.
A passenger on an early morning Indigo flight to Kolkata said they had boarded as scheduled and had now been sitting in the plane for the past one and a half hours. "We cannot see anything outside the window... every few minutes a further delay is being announced", he said.
The sudden foggy morning came after about two weeks of clear skies in the capital. Sunday was clear and pleasant with the maximum temperature at 22 degrees Celsius, three degrees above the season's average.
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