The glitch affecting Kuala Lumpur International Airport’s (KLIA) airport management system has yet to be restored after two nights, airport operator Malaysia Airports Holdings Berhad (MAHB) said.
Up to 20 flights on airlines bound for Narita (Japan); Perth, Sydney and Melbourne (Australia); Jakarta (Indonesia); London (United Kingdom); and Hong Kong were affected.
The disruption that affected both the main terminal, KLIA, and its low-cost terminal KLIA2, first began on Wednesday night.
Several airport systems that were affected include the Flight Information Display System (FIDS), check-in-counters, the Baggage Handling Systems (BHS), and Wi-Fi availability.
"Since the disruption, our team has been working round the clock, not only to rectify the situation but also to minimise the inconvenience caused to passengers," MAHB said in a statement.
MAHB said it was still trying to stabilise its systems at KLIA, as of 6am on Friday. It tweeted that systems were fully functioning by 10.41am on Thursday, save for the flight information display at budget terminal KLIA2.
MAHB has advised passengers to arrive at the airport at least four hours before their flight departure time. It also encouraged them to check in via the respective airlines' mobile apps or websites, and urged them to reach out to Airport CARE Ambassadors or call +603-8776-2000 for updates.
The disruption also affected immigration autogates, forcing immigration officers to process travel documents manually.
Some airport shops were also affected, with staff saying credit card transactions could not be processed because of poor Internet connectivity.