The Wall Street Journal reported that Delta Airlines (NYSE:DAL) and TPG Capital are both separately reviewing takeover bids for AMR Corp.AMR, which filed for bankruptcy late last November is currently in the process of restructuring its debt along with cutting labor costs.Delta Air Lines (NYSE:DAL) has potential upside of 54.5% based on a current price of $8.82 and an average consensus analyst price target of $13.63.Delta Air Lines is currently above its 50-day moving average (MA) of $8.12 and above its 200-day of $8.64.