Saw that the new sprint one month free plan is stackable with the Aadvantage 25,000 mile plan. There is a pop up on the link below which shows it.
Not as good when you could get the whole year free but still a pretty good deal if you're in the market.
Note: 25,000 miles should theoretically get you a round trip ticket in the domestic us in coach. Obviously probably not the day after thanksgiving, etc.