Thanks for the response. I was trying to figure out the flow of aircraft at NRT hub at this time.

I am flying this Saturday on NW27 to PVG from SFO. Due to the health situation, China is doing a pretty agressive quarantine program, especially for US flights, if anyone on the airplane that is suspicious, you will be quarantined, ususally for 7 days. After you exit the airport, if anyone on the same flight turns out to have the flu (say on the 2nd day or the third day), you will still be tracked down and quarantined. The measures are extreme and very unpleasant.

So I am trying to avoid taking NW27, at least on the 2nd leg from NRT to PVG, if possible. I have heard, due to health inspection in Japan, many people misconnect at NRT. NWA will put you up in a hotel and book you on a flight on the 2nd day. I was hoping I will misconnect at NRT then take another flight later. If I end up being on a MU, NH, or KE flights to PVG, I will have a much better chance of not getting into trouble (due to smaller percentage of US originating passengers and less focus on these flights from Chinese authorities).

if NW27 is using two different aircraft for these two legs, my chance of misconnecting becomes much better, since I only have about 2 hours to start with.