Jetblue plays with the prices
 

I wanted to book a flight for a group, and realized I had to call Jetblue to do so for a group of that size. The customer service rep told me it would be cheaper to break it up into two groups and do it online. When I went to do so, the price miraculously went up for the return flight I wanted, so I picked an earlier flight for a cheaper price. Low and behold...later that day, the return flight I wanted, went back to the original price. Don't let them know specifically what flight you're interested in, because if they realize that there's an interest, they will raise the price. Refer to another flight to use as an example.