I used milewise when I first started searching for award tickets for this trip but at that point I wasn't an Amex MR member and I was only searching the programs that I was a part of. Oddly enough though, I just did a search JFK-STI and it's not listing JetBlue as a transfer option from Amex MR nor is listing JetBlue as a cash option. However, it is listing it for JFK-POP. Either way, for now on I'll be sure to search all programs rather than just the programs I'm a part of.