Technically, what I'm doing is almost pointless, because LAX is the first port of entry into the US and all bags must be claimed and cleared through customs and re-checked, but it would still be easier if the bag was already tagged and then it could (maybe) be re-checked right after clearing customs in VA's terminal and not have to be schlepped over the B6's terminal. At any rate, there's enough time in the connection to schlep the bags over to B6's terminal and check in with them, (provided there aren't insanely long lines by immigration and customs). This could be done as 2 separate tickets, without VA tagging the bags for B6, why would there be an issue if they are in the same PNR?