By mid- to late 2006, HealthSouth, which never had to file for Chapter 11 Bankruptcy Protection, completed its recovery and relisted its stock on the New York Stock Exchange under the symbol HLS.
However you are correct about American Airlines actually being one of the rare cases where a company filed for Chapter 11 and common shareholders retained some significant value. So there you go, it's not impossible, but just so everyone is aware it's the absolute exception.