New Delhi, Dec. 6 -- IndiGo cancelled all its flights from Delhi until midnight and from Chennai until 6pm, a day India's biggest airline cancelled over 400 flights. The airline cancelled at least 104 flights from Mumbai, 92 from Hyderabad, and 102 from Bengaluru, leaving thousands of passengers stranded for a fourth day. IndiGo has 235 daily departures from Delhi. In a post to X, the Delhi airport announced the cancellation of IndiGo's domestic flights from the capital. "Operations for all other carriers remain as scheduled. Our dedicated on-ground teams are working diligently with all partners to mitigate the disruption and ensure a comfortable passenger experience." An official said IndiGo also cancelled all its departures from Chennai until 6pm. IndiGo's pilots, cabin crew, and ground staff issued an open letter accusing the airline of allowing a preventable operational breakdown that ultimately left front line workers to face passenger anger and public blame. The letter said the disruptions were "not just an operational failure - they were a failure of planning and frontline protection." It added that the staff across airports faced the full impact of cancellations and delays, including angry passengers, while strategic decisions were made far from the consequences. On Thursday, the carrier admitted to aviation regulators that its operational meltdown stemmed from "misjudgment and planning gaps" in adapting to crew fatigue rules it had two years to prepare for, as its on-time performance (OTP) fell to a historic low of 8.5%. IndiGo commands 60% of India's domestic market. The Ministry of Civil Aviation said that the Central Government is fully alert to the woes of air passengers and is in constant consultation with all stakeholders. "Every possible measure, including rule exemptions as announced by the Directorate General of Civil Aviation on Friday, will be taken to restore schedules and ensure stability to mitigate the public's woes," the statement added. Congress leader Rahul Gandhi alleged on Friday that the IndiGo "fiasco" is the cost of the BJP-led Centre's "monopoly model" and asserted that India deserves fair competition in every sector, not "match-fixing monopolies". "IndiGo fiasco is the cost of this government's monopoly model. Once again, it's ordinary Indians who pay the price -- in delays, cancellations and helplessness," the leader of opposition in the Lok Sabha said in a post on X. A passenger, scheduled to travel to Delhi, said the situation has left people frustrated. "In their frustration, the passengers were shouting and demanding an explanation for the flight delays and cancellations," the passenger, who wished not to be named, said. A traveller, Rishabh Kumar from Kolkata, said passengers were facing harassments at the hands of the airline. "I had to reach Delhi yesterday from Kolkata via Srinagar. This was a connecting flight. They (airline officials) told us in Kolkata yesterday that when we reach Srinagar, our flight to Delhi will be ready. But when we came here, they did not help us at all, neither the IndiGo, nor airport authorities," Kumar said. The Directorate General of Civil Aviation (DGCA) on Friday appealed to the Airline Pilots' Association of India (ALPA India) and Pilots for Cooperation amid ongoing IndiGo travel disruptions across the nation. In a statement, DGCA wrote, "In light of the current disruptions due M/s Indigo affecting air travel, where several flights across the country have been impacted due to operational constraints, unpredictable weather patterns, and rising seasonal demand, the aviation sector is experiencing significant strain. These disruptions have led to delays, passenger inconvenience, and increased pressure on airline operations." The DGCA said that the industry must prepare for even greater operational challenges, as passenger volumes are expected to rise sharply. "As we now approach the fog season, the peak holiday period, and the marriage travel season, it is crucial that the industry prepares for even greater operational challenges. Passenger volumes are expected to rise sharply, and weather-related impacts may further complicate scheduling and flight safety," the statement read. Earlier, the Airline Pilots' Association of India (ALPA India) wrote to the Directorate General of Civil Aviation (DGCA), expressing strong objection over selective and unsafe dispensations granted to IndiGo under the revised Flight Duty Time Limit (FDTL) CAR Phase II implementation. In its letter addressed to the DGCA, ALPA highlighted that the decision to extend exemptions to the airline contradicts prior agreements, compromises pilot safety, and undermines the intent of the FDTL regulations, which are designed to protect passengers and crew. IndiGo's continued delays and cancellation of flights has unfolded chaos at Indira Gandhi International Airport in the past three days. But the trouble of IndiGo's passengers is not just limited to this. Several people have complained of lost luggage and lack of support from the airline's customer support staff which have only aggravated their woes. On Friday at terminal 1, a 28-year-old electrical engineer from the US stood in queue for the third time since she arrived in Delhi on November 26. "It's been 10 days and I still can't get a hold of my luggage. All my family and I have done since I arrived is call IndiGo's customer care team... But they haven't been able to locate my luggage," she said. She is not alone. For the last few days, passengers across the country have complained about missing baggage, with many venting their frustration out on social media, often accusing the airline of not responding to their queries. While one X user lamented about missing luggage for 15 hours after arriving in Bengaluru where they had to attend a wedding, another tweeted at the airline about important medicines in his bag that was yet to be handed over to him after 24 hours. The 28-year-old woman's parents who had accompanied her to the IGI airport on Friday told HT, "Due to the volcanic eruption in Ethiopia, my daughter's booking with KLM airline got cancelled and they put her on an IndiGo flight. They told her that her luggage will be delivered at the final destination in Delhi on November 26. It's been over 10 days and she still hasn't found her luggage," said her mother, who asked not to be named. Her daughter had come to India for the first time since starting her first job in the US and had returned to Delhi bearing gifts for her parents. "We lodged a complaint with KLM airlines, and they sent us photos of her luggage being handed over to IndiGo. After days of back and forth with IndiGo, the airline sent us a photo of only one bag and said we are still trying to find the other one. They gave us the phone number of a person who would help us sort things out but we have called 100 times and all we get is a computerised response that the number is out of reach or is switched off," said the woman's mother. Deepa J, a 60-year-old who lives in the US, has spent the last 12 hours at the airport with no luggage and no idea when she will be able to take her connecting flight to Chennai. "I landed at T3 at 9.30 pm last night from the US, which itself was such a long flight, and then had a connecting flight from T1 to Chennai around 2.10am. That flight got cancelled and they gave another ticket for December 6 morning. I am moving around the airport in the same clothes as I don't have my luggage yet. I can't go to a hotel also since all my belongings are with IndiGo," Deepa J added....