As many as 25 Air India flights were delayed across its network on Saturday because of a technical malfunction in the check-in software. Flight operations were delayed at several airports, including New Delhi’s Indira Gandhi International Airport, for several hours, though the malfunction was reportedly rectified within 30 minutes. Services resumed around 5 pm.

“The software-related glitch affected operations from 1 pm to 2.30 pm, during which period, check-in and other services were handled manually,” an unidentified Air India spokesperson told PTI.

The national carrier said “unexpected connectivity problems” at the SITA data center in Atlanta city in the United States had a worldwide impact. Air India’s software is managed by SITA, which provides IT solutions to several global airlines. It provides the technology for check-in, boarding and baggage tracking.

Several passengers complained on Twitter that their flights were delayed for several hours.