If you were at Delhi airport this week, you probably saw long queues, frustrated flyers, delayed departures and confused staff running around.
Over 100 flights across Delhi and nearby cities were hit, and it all came down to one major tech breakdown inside the heart of India’s aviation system. Some reports even hint that a malware attack could be behind it. So what exactly went wrong at India’s busiest airport? And how did one glitch cripple operations across North India? Let’s break it down. First, what went wrong Late on Thursday night, a key system used by Air Traffic Control (ATC) stopped working. This system, called the Automatic Message Switching System (AMSS), shares essential data with airlines and ATC such as flight plans, routing information, and safety messages. In simple terms, AMSS is like the airport’s “brain” for flight data. The Airports Authority of India (AAI) confirmed a technical fault in the AMSS caused the disruption. Because the system went offline, air traffic controllers had no choice but to shift to manual processing, which slowed down everything from take-off permissions to aircraft landings. AAI said in a statement: Controllers are processing flight plans manually, leading to delays. This created immediate congestion in Delhi’s airspace and delayed flights through the night. How can one system bring Delhi airport to a halt? Delhi’s IGI Airport handles more than 1,500 flights a day and over 60 aircraft movements every hour. AMSS plays a critical role in sharing flight plans with all systems. When AMSS stopped working: This meant flight movements had to be spaced out for safety, causing delays to pile up rapidly. A senior aviation expert explained that AMSS works like a central nervous system, if that goes down, the body (airport network) struggles to function. Impact beyond Delhi: Mumbai issues advisory The effects of the Delhi system failure were felt in Mumbai as well. The Chhatrapati Shivaji Maharaj International Airport (CSMIA) issued a passenger advisory, alerting travellers of possible delays as the glitch affected interlinked flight operations and scheduling. “Authorities concerned are working actively to resolve the issue,” CSMIA stated, asking passengers to check flight status before heading to the airport. Several airlines warned of possible rescheduling or extended wait times due to the disruption of the inter-airport AMSS relay system. Is AMSS an outdated system? A major concern raised is whether the AMSS tech is too old for today’s high-traffic aviation environment. India’s flight numbers have grown massively in the last five years, but ATC infrastructure hasn’t kept pace, according to experts. Many airports globally have already moved to advanced automated data exchange systems, while India still depends heavily on older versions of AMSS and manual backups. Was it just a glitch, or a cyberattack? This is where the story gets worrying. News18 reported that agencies are checking if the AMSS failure may be linked to a malware-triggered automation fault that affected radar and system interface modules. Sources told the publication that the system was dealing with conflicting signals, possibly triggered during a security defence response against a malware attempt. While authorities have not officially confirmed a cyberattack, the timing raises questions, especially because this outage came just days after GPS spoofing incidents affecting Indian flights. This forced controllers into “manual mode” again, meaning two tech failures in one week increased ATC load drastically. Ripple effect across major airports The chaos was not limited to Delhi. Airports that fall under the same ATC region, including Lucknow, Jaipur, Chandigarh and Amritsar, also suffered delays. By Friday morning: AAI warned that clearing the backlog could take hours, because aircraft, pilots and crew must be repositioned before normal schedules resume. Airlines respond Airlines issued advisories urging passengers to check flight status before leaving home. Air India said: “This disruption is beyond our control. We regret the inconvenience and appreciate your patience.” IndiGo, SpiceJet and others assured that ground staff were trying to assist, but admitted that extended wait times were unavoidable.
Could this impact India’s aviation image and economy Frequent tech issues can reduce trust among global airlines that operate in and out of Delhi. A warning shot for India’s aviation tech infrastructure One technical fault exposed how dependent India’s aviation ecosystem is on a single system, and highlighted urgent need for stronger tech upgrades, backup systems that can kick in automatically and higher cyber defence around aviation networks.
Because at an airport that handles 73 million passengers a year, even a single system glitch can trigger nationwide turbulence.
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