India’s Delhi airport said its Air Traffic Control system faced a technical problem on Friday, affecting several flights at one of the world’s busiest airports.

Top airlines IndiGo, Air India and SpiceJet said their flight operations were affected, leading to delays and longer wait times.

“Due to a technical issue with the Air Traffic Control system, flight operations at Indira Gandhi International Airport are experiencing delays,” the airport said in a post on X.

IndiGo said flight operations at Delhi and several northern regions were impacted.

The airlines did not elaborate further.

Data from Flightradar24 showed dozens of flights were delayed, with several departure timings in the red for Friday morning. The website said the average departure delay was 55 minutes.

About 25 flights were affected yesterday after the problem with the ATC system occurred on Thursday evening, a source familiar with the matter told Reuters.

Delhi airport handled about 78 million passengers in 2024, making it the ninth busiest airport in the world, according to Airports Council International.

The Airports Authority of India was not immediately available for comment.