A typhoon warning could delay the opening of Chek Lap Kok airport for a week, an official said yesterday. A decision would be made several days before the July 6 opening if the No 3 signal was hoisted, said the director of the New Airport Projects Co-ordination Office, Keith Kwok Ka-keung. The move from Kai Tak is due to start at 5.30 pm on July 5 and end at 6.30 am the next day. If there was a typhoon the move would be postponed until July 12, Mr Kwok said. Based on records from the past 40 years, there was a 50 per cent chance of a typhoon in the 10 days around July 6. Airport Authority spokesman Clinton Leeks said a typhoon assessment could be made about three days before the overnight move. 'Our aim is to have a smooth relocation and not to take any unnecessary risks,' Mr Kwok said. 'We will not allow Hong Kong to be without an airport. 'We will not allow the relocation to be stopped in the middle because of a typhoon and have Kai Tak airport closed while the new airport is not ready to open.'