Auctions are a fun way to spend down your frequent flyer account balance and a recent AirTran A+ Rewards auction caught our eye — an autographed Hank Aaron baseball. If you’re not a sports buff, you might not know that Mr. Aaron held the record for most career home runs as a Major League Baseball player, until Barry Bonds broke the record this past summer.

After two weeks and 15 bids, the ball sold for 37.75 credits, equivalent to two roundtrip award tickets with a few credits to spare. On eBay, Hank Aaron autographed baseballs usually sell for about $200, which can be of substantially less value than a couple of roundtrip tickets. However, for one baseball fan, AirTran’s online auction was a perfect way to spend some credits. See what’s up for bid now at http://www.skymall.com/airtranauction