Glen: Since we are now within 90 days of flight to Sandestin, you should be able to get seat assignments. Since my flight is separate and purchased with FF miles, I was able to do this on Monday for flights on the 9th. I have 12B on 5765 and 3B on 4349. Just thought I would let you know so you could do same.
*Note saw 12 seats already booked at back of plane for both flights, and maybe it is rest of group