DISTRICT board members have vowed to take more radical action to force the Civil Aviation Department to throw out a plan to increase flights at Kai Tak. Shamshuipo District Board chairman Wong Chung-ki said members were opposed to any increase in the number of landings and takeoffs at the airport. A decision on Wednesday to shelve plans to extend operations by one hour still left the Government with the option of increasing the number of flights in the mornings and evenings. The Economic Services Branch said the curfew would be maintained, although it and the aviation department were still looking at increasing flights. Flights are currently restricted to eight an hour from 6.30 am to 7 am, and 9 pm to 11.30 pm. They could be increased to 18 an hour under the proposals. The aviation department said it was turning away about 300 flights a week because of the current self-imposed restrictions, meaning a massive loss in potential tourism revenue. The proposals would add about $4.3 billion a year to the economy, it said. Mr Wong said: 'We will prepare for more radical action to make sure they do not increase flights in the morning and at night. 'The residents are very opposed and we all object to this. They must consult the locals more. 'The current number of flights is the maximum tolerable for the residents - not even one more is acceptable.' Members of the Shamshuipo board and four others affected by Kai Tak noise - Kwun Tong, Kowloon City, Wong Tai Sin and Eastern - have for months protested against the plan, holding sit-ins at the airport and sending petitions to the Government. Industry insiders said senior aviation department and branch officials had indicated the remaining part of the plan would be implemented. On Wednesday, Legco rejected by 27-22 a motion by Democratic Party chairman Martin Lee Chu-ming opposing the Government's plan. The Government needed Legco approval to extend the airport's operating hours, but not to increase flights. An aviation department spokesman stressed yesterday that a decision had not yet been made. The matter would only be decided after consulting the Advisory Committee on the Environment, which is to meet next month or in June, the spokesman said.