Originally Posted by
sbm12
This is not true.
Doesn't change the fact that the OP's family should bring their bags to C to recheck them, but JetBlue absolutely does allow for baggage interlining with its international partners. That's part of the interline agreement it has.
At what airport do they interline with partners? I thought most of their interline partners in Boston and New York operate at other terminals, therefore don't interline.