I was just goofing at work today (dont tell my boss) and I was looking at March 2009 flights to Belize on American and if you checked your dates are flexible when booking it was offering 1st class Ord to Mia to Bze return home economy class for 814.00 plus tax - seems like a good deal for first class for 1/2 of the trip. When I tried to get first class on the way home by selecting first class the price went way, way up.

UPDATE - I booked Chi Dallas Belize first class and return coach/economy class for $850 for March 2009 and after I booked I called American and was able to upgrade the return to first class for 12500 miles per ticket.