Oops - dates mixed around [nice catch!]- my bad. Updated numbers here:

Since October 1st, 2010 [When SMI/J took over]:

Spirit Air: +396%
Alaska Air Group: +301%
Delta: +217%
US Airways Group: +148% [Ended when AAL began]
Southwest: +98%
UAL: +80%
JetBlue: +36%

American [SINCE 2013 out of bankruptcy]: 48%
And in theory, AAMRQ (The older, now defunct AAL) was at +73% when the transition to AAL (the one above) occurred.
SkyWest: -14%

Dow: +53%
S&P500: +64%

So, he has underperformed relative to other carriers.