Do they let the Americans do that, or do you have to be Japanese?

I have seen 50s with XJ on them, but maybe that was back when NWA still had a couple gates there. Same for the Compass EMBs - I haven't seen one in months hence my quote "occasionally Compass"

Maybe they were XJ tail numbers flying for Pinnacle?

In any case, I guess that proves the old adage "Once Delta cuts you to nothing, the next round of cuts falls on the other guy"