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Domestic carrier IndiGo has cancelled over 180 flights from three major airports — Mumbai, Delhi and Bengaluru — on Thursday, December 4, as the airline struggles to secure the required crew to operate its flights in the wake of new flight-duty and rest-period norms for pilots.

While the number of cancellations at Mumbai airport stands at 86 (41 arrivals and 45 departures) for the day, at Bengaluru, 73 flights have been cancelled, including 41 arrivals, according to a PTI report that quoted sources.

"IndiGo cancelled over 180 flights on Thursday at three airports-Mumbai, Delhi and Bengaluru," the source told the news agency.

Besides, it had cancelled as many as 33 flights at Delhi airport for Thursday, the source said, adding, "The number of cancellations is expected to be higher by the end of the day."

The Gurugram-based airline's On-Time Performance (OTP) nosedived to 19.7 per cent at six key airports — Delhi, Mumbai, Chennai, Kolkata, Bengaluru and Hyderabad — on December 3, as it struggled to get the required crew to operate its services, down from almost half of December 2, when it was 35 per cent.

"IndiGo has been facing acute crew shortage since the implementation of the second phase of the FDTL (Flight Duty Time Limitations) norms, leading to cancellations and huge delays in its operations across the airports," a source had told PTI on Wednesday.

Chaos continued at several major airports for the third day on Thursday because of the cancellations.

A spokesperson for the Kempegowda International Airport (KIA) in Bengaluru said that 73 IndiGo flights had been cancelled on Thursday.

At least 150 flights were cancelled and dozens of others delayed on Wednesday, airport sources said, leaving thousands of travellers stranded, according to news agency Reuters.

The Directorate General of Civil Aviation (DGCA) has said it is investigating IndiGo flight disruptions and has asked the airline to submit the reasons for the current situation, as well as its plans to reduce flight cancellations and delays.

It may be mentioned here that the pilots' body, Federation of Indian Pilots (FIP), has alleged that IndiGo, despite getting a two-year preparatory window before the full implementation of new flight duty and rest period norms for cockpit crew, "inexplicably" adopted a "hiring freeze".

The FIP said it has urged the safety regulator, the DGCA, not to approve airlines' seasonal flight schedules unless they have adequate staff to operate their services "safely and reliably" in accordance with the New Flight Duty Time Limitations (FDTL) norms.

In a letter to the DGCA late on Wednesday, the FIP urged the DGCA to consider re-evaluating and reallocating slots to other airlines, which have the capacity to operate them without disruption during the peak holiday and fog season if IndiGo continues to "fail in delivering on its commitments to passengers due to its own avoidable staffing shortages."

With IndiGo flight disruptions impacting thousands of passengers, the airline on Saturday said that it will offer full waiver on all cancellations/reschedule requests for travel bookings between December 5, 2025 and December 15, 2025.

Earlier in the day, the civil aviation ministry had directed the airline to complete the ticket refund process for the cancelled flights by Sunday evening, as well as ensure baggage separated from the travellers are delivered in the next two days.

In a post on X, titled 'No questions asked', IndiGo wrote, "In response to recent events, all refunds for your cancellations will be processed automatically to your original mode of payment."

"We are deeply sorry for the hardships caused," it further added.

Several passengers, however, complained of not getting full refund as promised by the airline.

Netizens have shared screenchots of getting charged for airline cancellation fee and convenience fee.

"Please tell me why u have did this airline cancellation charges when u say full amount will be refunded (sic)," a user wrote sharing a screenshot of the refund page.

"Well, but you have still debited the convenience charges," wrote another.

Passengers have also raised concerns about the "cancel" option being disabled on the IndiGo app. "First enable the 'Cancel' button on your App & offer full refund on tickets cancelled by customers between the said dates," wrote a user.

A day after the country's largest airline, IndiGo, cancelled more than 1,000 flights and caused disruptions for the fifth day on Saturday, the ministry said that any delay or non-compliance in refund processing will invite immediate regulatory action.

The refund process for all cancelled or disrupted flights must be completed by 8 pm on Sunday, the ministry said in a statement.

"Airlines have also been instructed not to levy any rescheduling charges for passengers whose travel plans were affected by cancellations," it said.

On Saturday, more than 400 flights were cancelled at various airports.

IndiGo has also been instructed to set up dedicated passenger support and refund facilitation cells.