The check-in systems of affected airlines at Changi Airport have been restored after experiencing almost three hours of technical glitch.

Changi Airport has earlier issued an advisory saying that a technical issue was affecting the check-in systems of some airlines.

It was reported by Channel NewsAsia that airlines affected include Singapore Airlines, Qantas and Lufthansa.

Quoting Singapore Airlines, the report said that the airline became aware of the global outage of some of its systems at about 5.30pm on Thursday.

According to Changi Airport's website, today, a flight takes off or lands at Changi Airport approximately once every 100 seconds.

Over 100 airlines are flying to some 380 cities in about 80 countries and territories worldwide from Singapore.

International media reported that a software issue has caused check-in delays at several airports worldwide, and booking problems for many airlines.

Passengers reported problems at Gatwick, Paris Charles de Gaulle and Melbourne airports among others, said one report.

Gatwick blamed a passenger management system called Amadeus Altea but said the problem had been resolved and there were no further delays.

Amadeus said it had identified a "network issue" but that services were being restored, said the report. - BERNAMA