All Nippon Airways has asked the transport ministry to grant it all four daily slots for U.S.-bound flights from Tokyo's Haneda airport to be allocated to Japanese carriers when they become available in October, sources said Wednesday.

ANA is arguing that allowing Japan Airlines, restructuring with the help of the government, to open new routes "will distort the competitive environment," the sources said.

The Land, Infrastructure, Transport and Tourism Ministry has been making arrangements to give two slots each to ANA and JAL but might review its plan, the sources said.

The U.S. Transportation Department said it will approve Delta Air Lines, American Airlines and Hawaiian Airlines to inaugurate flights from the U.S. to Haneda if no objections are lodged.