I would say two hours would be best.
Last time we got to the airport with about 60-90 min. The line was really long at about 8 in the morning. Then the security line was really long, I mean really long. Then for some reson we had to take a little airport shuttle to the jet blue terminal, which I never knew about(never did this for any other airline), so that took time for loading ect. We were hot, and stressed out from running all aver the place! Never again, I would rather get there 2-3 hours before, wait and have breakfast or something.
The year before we went about the same time and there was no one in the lines, so better to be safe.