When they entered Bankruptcy they changed their stock symbol from AAMR to AAMRQ. The Q tells investors that the company i in Bankruptcy. This i what the SEC says about the Q:


  "Q" Added To Stock Ticker Symbol
  
  When a company is involved in bankruptcy proceedings, the letter "Q"
  is added to the end of the company's stock ticker symbol. In most
  cases, when a company emerges from bankruptcy, the reorganization plan
  will cancel the existing equity stock and the old shares will be
  worthless. Given that risk, before purchasing stock in a bankrupt
  company, investors should read the company's proposed plan of
  reorganization. For more information about the impact of bankruptcy
  proceedings on securities, please read our online publication,
  Corporate Bankruptcy.


The risks are they never recover, or that the old shares have nothing to do with new company. Many investors don't understand this. Recently some uninformed investors(?) tried to get a jump on the Twitter IPO by purchasing share of what they thought was Twitter but was instead the bankrupt company Tweeter Home Entertainment.


  Shares of Tweeter Home Entertainment, a Boston-based consumer
  electronics chain that filed for bankruptcy in 2007, soared Friday in
  a case of mistaken identity on Wall Street.
  
  Apparently, some investors confused Tweeter, which trades under the
  symbol TWTRQ, with Twitter and piled into the penny stock.
  
  Tweeter, which trades over the counter, opened at 2 cents a share and
  jumped as much as 15 cents — or 1,800 percent — before regulators
  halted trading.
  
  Almost 15 million shares had changed hands at that point, while the
  average daily volume is closer to 150,000.


Sometimes it does happen that the new company does give some value to the old investors, but more often then not the old investors are completely wiped out.

Stocks and Bankruptcy
I am facing below error. I have created web part in SharePoint 2010 solution and deploying that web part in Sharepoint 2013 Foundation. After I install webpart I face bellow error in central administrator.


  [MissingSetupFile] File [Features\4Project\ChangePassword\ChangePassword.webpart] is referenced [1] times in the database [WSS_Content_5000], but exists only under Microsoft SharePoint Foundation 2010 setup folder. Consider upgrading the feature/solution which contains this file to the latest version. One or more setup files are referenced in the database [WSS_Content_4500], but are not installed on the current farm. Please install any feature or solution which contains these files.

