AirTran out of Baltimore to Montego Bay remains the the best for good rates. On my previous trips, I have found their non-stop flight to be cheaper than any other airlines that have a stop. I really don't think the "check on Tuesday after midnight" for best fares necessarily works. I used matrix.itasoftware and expedia, cheapoair, travelocity etc to check airfares and then book directly with the airlines. I have also found that sometimes the fares are cheaper if you book one way tickets.