Shares of InterGlobe Aviation, the parent company of IndiGo Airlines, dropped more than 6.5% during early trading on Monday as scrutiny mounted over the airline's ongoing flight disruptions. The stock reached an intraday low of ₹5,015 on the BSE before partially recovering to ₹5,159.50 around 9:45 a.m., still down 3.93%.

The sell-off came after the Directorate General of Civil Aviation (DGCA) extended the deadline for IndiGo CEO Pieter Elbers to respond to a show-cause notice related to the airline's operational breakdown. The aviation regulator had issued the notice to IndiGo's accountable manager on Sunday, following a similar directive to the CEO.

The DGCA highlighted that large-scale cancellations over the past week had caused significant inconvenience for passengers at multiple airports. According to the regulator, these disruptions were due to IndiGo's inadequate planning for implementing revised Flight Duty Time Limitations (FDTL) rules, which set maximum duty hours and minimum rest periods for flight crew. The DGCA cited "large-scale operation failures" as indicative of lapses in planning, oversight, and resource management.

IndiGo's accountable manager has been given 24 hours to justify why enforcement action should not be pursued. If the airline fails to respond in time, the DGCA has stated it will proceed based on available information.

Despite the regulatory pressure, IndiGo announced on Sunday that it has restored 95% of its network and is operating approximately 1,500 flights daily. The airline projects full stabilisation by December 10, with improved on-time performance and reduced cancellations.