Or generally, if there are flights available in the lower tier of pricing, it's available. Right now pricing for BDL- MCO for July- August Ranges from $114-307 in the Wanna get away fares. $114 and $146 are elligible for RR use, $162 and above are not.
Generally it's the lower two- tiers of fares. For my market (BLD-MCO) it seems it usually has to be under $150.
The only exception to this has been that recently I found they opened up higher priced seating in the week before travel.
SO, If you find that your first choice for a flight is not available, but your second choice is, book the second choice, then 7 or 6 days before travel check back and see if your first choice is now available.