We just did American to Punta Cana in February and I must say we certainly prefer Jet Blue. This past January we did the BOS-JFK-SXM trip on the way down on New Years Day and SXM-BOS direct on the way home. We had no issues and got in very early around 12:30pm. It was great but you never know what can happen so we are looking for either direct down or a stop somewhere further south.