Your plans to fly in and out of Delhi between September 8 and 11 could get affected as the government has directed commercial airlines to cut 20-25% flights to make parking space for the large number of VVIP aircraft expected at IGI Airport for the G20 Leaders' Summit. Delhi International Airport Ltd (DIAL) said on Saturday said it has already got requests to cancel 80 domestic arrivals and as many domestic departures over three days in that period.

from Times of India https://timesofindia.indiatimes.com/india/leaders-summit-igia-already-gets-requests-to-cancel-160-domestic-flights-says-no-plane-parking-problem/articleshow/103089393.cms