The curbs on flying by the non-scheduled operators remained in force for over six hours today, sources said.
The restrictions would also remain in effect for almost entire day tomorrow, according to a Notice to Airmen (NOTAM) issued by the Airports Authority of India (AAI).
"Between 1130 hours and 1800 hours on October 28 and between 0300 hours to 1230 hours and 1330 hours to 1730 hours no flight (will be) permitted to take off and land at the Indira Gandhi International Airport, Delhi, and subsidiary airports within 300 kms zone of Delhi," the NOTAM said.
Notice to Airmen (NOTAM) is a notice containing information concerning the establishment, condition, or change in any facility, service or procedure, among others, in airspace management.
As many as 48 of the total 126 non-scheduled operator's permit holders in the country have their base at Delhi, as per the DGCA website.
Representatives of 54 African nations, including heads of state and governments of around 40 countries and powerful African Union are participating in the four-day long meet, which began here on Monday.