United and Continental airlines are reducing flights between the U.S. and Japan because of a drop in demand since the March 11 earthquake and tsunami.
The sister airlines will cut their combined passenger-carrying capacity on U.S.-Japan flights by 10 percent in April and 14 percent in May.
Spokeswoman Julie King said Thursday the airlines will drop a few flights a week between four U.S. cities and Tokyo, and will delay adding a second daily flight between San Francisco and Tokyo by a month, until April 27.
King said the moves were made "because of the measurable decline in demand for travel between the two countries," but she wouldn't put a percentage figure on the drop-off.
The news from United Continental Holdings Inc. came one day after AMR Corp.'s American Airlines said it will suspend two of its six daily flights to Japan next week until late April. Delta Air Lines Inc. said last week it will suspend service to Haneda Airport in Tokyo, although it will keep flying to the other big Tokyo airport, Narita.
Travel to, from and within Japan has slumped as the nation deals with power shortages and fear of radiation leaks from a damaged nuclear power plant.
King said United will drop some flights each week between Tokyo Narita and Los Angeles, Seattle and Washington's Dulles International Airport. Continental will do the same on its Narita-Newark, N.J., route, which will lose seven round trips in May.
United also is switching to smaller planes _ Boeing 777s instead of 747s _ on its Chicago-Narita route because of the weak demand.
Continental previously announced it stopped flights from Guam to Sendai, Japan, because of damage to the Sendai airport.
Together, United and Continental have 1,000 employees at nine airports in Japan.