The roar of a jumbo jet will be heard at Chek Lap Kok for the first time on May 2, but no passengers will be aboard. A Cathay Pacific Boeing 747 - empty apart from crew - is scheduled to land as part of a series of trials at the new airport. The plane, having taken off from Kai Tak, will then return to the old airport. Plans for a charity passenger flight had to be shelved after safety concerns were raised by the Government, but Cathay still hopes to fly about 300 disadvantaged children and elderly people to Chek Lap Kok soon after it opens in July. Airline officials are checking if the specially painted Spirit of Hong Kong 747 will be available for the flight aimed at testing airport services ahead of the opening. The green plane with Hong Kong's skyline painted along the fuselage was decorated for the handover and is used to promote the SAR and the airline. Cathay spokesman Kwan Chuk-fai said he hoped the airline's charity 'flights' - which involve passengers checking in, watching a movie and getting an in-flight meal but do not leave the ground because of a lack of departure slots at Kai Tak - would be able to take off at the new airport. 'We wanted to boost the profile of the airport among the Hong Kong community and allow more people to experience flying as well as the unique experience at Chek Lap Kok so we proposed this charity flight,' he said. 'We understand the reasons why they did not allow it before the airport fully opened, but we hope to have a flight, maybe in August.' Planes to have landed at Chek Lap Kok so far have been small aircraft such as the twin-engine Super King Air which took Financial Secretary Donald Tsang Yam-kuen on the inaugural flight to Lantau.