IndiGo has said that its systems were down across the network since Monday morning, as a result of which operations at airports are expected to be impacted badly.

“All efforts are being made to resolve the issue at the earliest,” IndiGo said in a statement.

IndiGo, owned by Interglobe Aviation Ltd, is the country’s largest carrier with a nearly 50% share of the domestic market. Irate travellers, who were affected by the outage took to Twitter to raise concerns.

“IndiGo says systems down and huge queues till outside the main entrance gates in Mumbai T2,” one user with the handle @Sathyantweets tweeted, referring to Terminal 2 at Mumbai’s airport. “Chaos. No one knows when it will be resolved.”

IndiGo’s outage had come at a time when dozens of flights had already faced delays or cancellations on Monday due to low visibility because of hazardous air pollution shrouding New Delhi.

Interglobe Aviation’s shares had risen 0.3% by 1215 local time (0645 GMT) in Mumbai, while shares in rival airline SpiceJet Ltd were down 2%.