Long queues of passengers were witnessed at the Delhi airport on Sunday as a technical snag in the nationwide system of IndiGo Airlines caused delays across the grid.

The system went down for around 90 minutes. The glitch was subsequently rectified but delays in flights continued as a ripple effect of the system disruption.

The budget carrier had put up a tweet in the afternoon today informing passengers of the system failure and resultant delays.

“Our systems were down at all the airports for a while. We are expecting the counters to be crowded more than usual. Seek your patience and co-operation,” the tweet read, asking passengers to call, access the official website or chat on Twitter/Facebook for information.

#6ETravelAdvisory: For assistance, contact us on Twitter/Facebook or chat with us at https://t.co/Mj1tYZIvoE. You may also call us at 01246173838. pic.twitter.com/30eW68kpTM

— IndiGo (@IndiGo6E) October 7, 2018

In a statement issued after the resolution of the snag, Indigo said that flights and check-in systems were operating normally.

“We regret the inconvenience caused to our passengers this afternoon due to system being down across airports for around 90 minutes. Our flights and check-in systems are operating normally now,” an Indigo statement said.

According to reports, the system failure has resulted in a pile up of flights. Delays are likely to continue till the end of the day today.

Passengers tweeted about the delay alleging that there was no contingency plan.

@IndiGo6E Airport chaos at Terminal 1 airport. Your servers are down from past 50 mins. Poor co-ordination no announcement of any sort. Standing in queue from 2 hours #shame #indigo pic.twitter.com/LvsbM9zMV8

— Salman Ahmad (@Salman2Ahmad) October 7, 2018

seems the airline staff never did contingency planning for system failures!#indigo pic.twitter.com/wHcViWIiHX

— Gudakesh (@gudakesh26) October 7, 2018

#indigo airlines server is down since last 45 minutes at Delhi airport. No contingency plans. People are waiting in queue pic.twitter.com/RCUA2qJATJ

— Sandeep (@atomicsandeep) October 7, 2018