Update: Still no idea how the passengers ultimately got to LGB, I did notice that the return flight to BOS that night departed 4 hours late from Burbank, so I imagine they bused folks from BUR to LGB and from LGB to BUR. But today we got a "we're sorry" $50 credit e-mailed over from JetBlue. Considering their history, this was not unexpected, but if they hadn't done it, considering it was a weather issue, I would have had zero complaints.