India, Dec. 5 -- Scenes of escalating chaos are unfolding at airports nationwide as IndiGo's network struggles to stay airborne. Long queues, frayed tempers and anxious appeals at airline counters have become the norm, with passengers stranded for hours amid a wave of cancellations and delays that has battered the country's largest airline for a fourth straight day.

More than 1,000 IndiGo flights have been cancelled over the past four days. The cancellations have hit major hubs including Delhi, Bengaluru and Hyderabad, where hundreds of departures and arrivals have been scrapped in rapid succession.

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IndiGo has attributed the chaos to a "multitude of unforeseen operational challenges," i...