AMSS System Outage at Delhi Airport Resolved; Flight Operations Gradually Restored
A technical outage in the Automatic Message Switching System (AMSS) disrupted Air Traffic Control (ATC) at Delhi's Indira Gandhi International Airport, causing severe delays affecting over 800 flights. The system has since been restored, and normal operations are progressively returning with residual delays and congestion expected temporarily. Airlines and airport authorities are assisting passengers during this transition.
On November 6, 2025, Delhi's Indira Gandhi International Airport experienced a significant technical failure in the Automatic Message Switching System (AMSS), a critical communication network supporting air traffic control flight planning. This outage forced air traffic controllers to manually process flight plans, resulting in delays for over 800 flights and widespread disruptions across northern region airports. The AMSS outage affected data transmission related to flight plans, weather updates, and operational information, disrupting automated ATC processes. Technical teams including the Airports Authority of India (AAI), Electronics Corporation of India Limited (ECIL), and original equipment manufacturers worked continuously to resolve the issue. By late November 7, the AMSS was restored, facilitating the gradual resumption of normal automated operations. Airlines such as IndiGo expressed appreciation for the efforts to resolve the problem and cautioned passengers about continuing delays and terminal congestion during recovery. Passengers were advised to check flight statuses with their airlines and expect some residual impact as backlogs clear. Delhi Airport and AAI acknowledged the disruption and emphasized coordinated efforts to restore service swiftly. This incident highlights the critical vulnerability of key ATC communication systems and the complexity of managing flight operations during automated system failures.
