SEL-TYO segment with CO code is the one that creates availability problems. But for travel agent it is possible to book under Northwest code (first segment SEL-NRT) and with NW code there are much more seats available (fare remains same). Any other airlines, KE for example, is also good.
It is not possible to stop over in GUM or HNL or LAX, only transfer.
[This message has been edited by fokker50 (edited 06-07-2001).]