I have what might be a really dumb question. I'm thinking about signing up for a JetBlue rewards credit card for the sign on bonus of 30k points. My question is - can I pay for part of the flights in points and part in cash? The dates for our flights aren't open yet, but it seems one person's round trip flight will be right around 30k points.

But let's say each person's is 31k. Plus, I'll be booking flights for our family of 4. Do I need to be able to cover the entire 4 flights with points? Do I just need to be able to cover one flight with points? Or can I cover any shortage with cash?