AIRPORT operations could resume within an hour even in the worst-case millennium-bug scenario, officials say. An emergency control centre at Chek Lap Kok will start work at 6pm on December 31 to monitor systems until at least 10am on January 1. The centre will also operate during typhoons. Few flights are scheduled in the six hours from midnight on December 31. The Airport Authority is still finalising a list of inbound and outbound flights. Speaking during the fifth and final airport-wide Y2K drill at the centre, Eric Wong Wai Lun, general manager of operations support, said on Friday night the key concern was communications. If the digital system broke down, communications would be switched to an analogue system which was free from Y2K problems. The Airport Authority has also prepared teleprinters for information transmission as a last resort. They will be used in case computer systems and fax machines cannot function. The Flight Information Display System will take just 19 minutes to restart if it encounters Y2K problems. 'Including the time needed to spot the problems, it would only take an hour to restart the system in the worst case,' Mr Wong said. The baggage system would take 45 minutes to switch to the back-up system. A total of 124 systems related to airport operations have been tested. Most were Y2K-compliant. Only minor equipment not affecting normal operations was found to be non-compliant. 'We cannot say we are 100 per cent confident that there will not be any inconveniences as no one has experienced the millennium bug problem,' Mr Wong said. Acting airport management director Howard Eng said yesterday he was worried that problems with outside systems could affect Chek Lap Kok, such as through the arrival of unscheduled flights.