The flight that took off from Goa could not land at the Delhi airport due to dense fog, and was diverted to the Mumbai airport on January 14
source https://www.thehindu.com/news/national/indigo-passengers-refused-to-board-airline-coach-sat-on-tarmac-after-landing-at-mumbai-airport/article67743327.ece
source https://www.thehindu.com/news/national/indigo-passengers-refused-to-board-airline-coach-sat-on-tarmac-after-landing-at-mumbai-airport/article67743327.ece