Wirelessly posted (BlackBerry: BlackBerry8530/5.0.0.1030 Profile/MIDP-2.1 Configuration/CLDC-1.1 VendorID/417)
I don't know the answer to your question, but I'm pretty sure that there are some credit cards that offer price protection for a limited period of time (30 days? 90 days?). You might check to see whether any of your cards offers such a benefit.
What terminal(s) will you be in at JFK?