Originally Posted by
paperwastage
that said, you can keep an eye out on SFO-SIN (nonstop) for the fare bucket to open if you want the nonstop, or switch to UA (on the SFO-NRT segment for purposes of United Millionmiler)
Noting that the UA inflight experience (service, meals, cleanliness of lavs) will be significantly inferior. But the time savings and million mile credit may be relevant considerations.