Originally Posted by
drjeffrock
Correct. AF flight # for CDG-NRT, then SB flight # from NRT-NOU. I haven't actually paid for the ticket yet, as you need to get approval to even book the ticket. Maybe I can ask the AF rep to assign an AF flight # for the NRT-NOU leg, if possible. (That opens up another can of worms since the government technically approved her to take the SB flight, not AF.)
CDG-(AF)-NRT-(SB)-NOU is actually a standard route for French vacationer heading to New Caledonia. Before COVID-19, during peak of French vacaiton seasons (vacances in French?

) SB (Air Caledonie) opereated NRT-NOU daily (7 flights every week) which is not because there is that much demand between Japan and New Caledonia, but there is that much demand between France and New Caledonia. It is daily event where French vacationers transiting at NRT between AF (Air France) flight and SB (Air Caledonie) flight.
It will be pretty much likley your wife will not be the only passenger on CDG-NRT AF flight connecting to SB (Air Caledonie) flight at NRT, likely there will be a lot. AF at CDG should be aware of this and SB at NRT is for sure aware of this, it is pretty much daily event at NRT between AF and SB. I am sure AF and SB will work togather in case of delay flight. It will be highly unlikly your wife will be the only person stranded at NRT in case of irregualr operation.
During COVID era I do not know how AF and SB are corrdinating transit at NRT but for sure your wife's situation will not be unusual, but will be routine situation where AF and SB know how to deal with the situation