If I were going to go that route, I'd go eBay instead. Bidders out there drive these certs way up beyond what FT'ers would give to you.

The exception is if he is doing a one-for-one trade for another airline's comparable cert. For that, FT is a good place to go.

Selling/trading the certs on either Coupon Connection or eBay is firmly against the rules of the AAdvantage program and involves risks for both buyer and seller, but I assume everybody already knows that.