NEW DELHI: Over 10 lakh passengers missed their flights during IndiGo's December meltdown even by conservative estimates, it has emerged.

The shocking extent of the chaos that were unleashed by " problems in Indigo'ss crew rostering and internal planning systems ", according to Union Aviation Minister Ram Mohan Naidu, came to light on a day when the airline cancelled nearly 500 flights.

The Directorate General of Civil Aviation (DGCA) is currently examining the airline's response to a show-cause notice issued to its CEO before taking any final action, sources said.

Officials from the Ministry of Civil Aviation said that between December 1 and 7 a total of 5,86,705 ticket PNRs (Passenger Name Records) were cancelled.

Since each PNR can include multiple passengers—up to nine in s

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