Northwest Airlines wants to postpone the planned March debut of its Seattle-Beijing route by a year.

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Northwest Airlines wants to postpone the planned March debut of its Seattle-Beijing route by a year, industry publication Aviation Week reports. The Delta subsidiary requested the deferral in a filing with the U.S. Department of Transportation, which approved the route.

The airline also plans to delay by three months the launch of its Detroit-Shanghai service, initially scheduled to begin in March, and to start with four weekly flights rather than seven.

Northwest attributed the delays to a 30 percent year-over-year decline in advance March bookings for U.S.-China travel, Aviation Week said. Airlines including American, US Airways, Continental and Delta have already received Transportation Department approval for reducing services from U.S. cities to Beijing, Guangzhou and Shanghai.

Last month Northwest said it will drop its daily nonstop flight between Seattle and London on Jan. 8.