More than 400 flights at Indira Gandhi International Airport were hit by delays on Friday after a malfunction in the automatic message switching system (AMSS) slowed down air traffic control operations, leading to controllers processing flight plans manually.

The disruption affected both arrivals and departures at the country’s busiest airport, leading to long queues and delays across multiple airlines.

The Airports Authority of India (AAI) confirmed that the technical fault had affected data exchange systems used by air traffic controllers. In the absence of automatic processing, controllers shifted to manual handling of critical operational messages, a move that significantly increased workload and lengthened turnaround times.

The AMSS is a crucial digital platform that enables se

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