Shares of prominent U.S. airline American Airlines Group Inc. (AAL, Financial) have taken a monumental beating over the past year, shedding more than 20% in value year to date. Declining profitability, waning travel demand and the topsy-turvy economic climate dragged down its performance. While recent momentum in the stock sparked hopes of a potential turnaround, fair value estimates based around realistic assumptions suggest otherwise. However, with the steep drop in value and gurus raising their stakes, a ...