The Transport Ministry is looking at turning Tokyo's Haneda airport into a 24-hour-a-day operation, ministry officials said Jan. 30.International charter flights would be allowed once the hours of operation are extended, they said. Currently, the airport operates between 6 a.m. and 11 p.m.According to the ministry, a new 3,000-meter runway will open on March 27, and the number of daily flights at Haneda -- currently about 280 -- is expected to increase by about 40 flights. The ministry has reportedly been negotiating with the Tokyo Metropolitan Government and local residents on allowing the extended operation of the airport and is engaged in the last stage of negotiations.