Airlines have done extremely well since my last post in this thread on
14 September 2012.
The $XAL has more than doubled, but the S&P 500 is "only" up by about 33%.
However in the last couple of weeks as $BRENT rose above $110, airline stocks suffered.
The worst performers have been non-US airlines, such as GOL, AF (France), LHA (Germany). CEA and ZNH have done poorly in the last year, but their volume on the NYSE is quite thin.
Of the US airlines, SKYW looks the weakest, and of the big-four, UAL looks weaker than LUV, DAL and AAL.
Shorting airlines because of oil is risky. Capacity is a bigger driver : and right now there isn't much of it. So airlines can pass oil prices on.
I use the Altman Z-score as one of my principal trading tools both on the long as well as the short side. However I wouldn't recommend automatically shorting a stock just because it has a low Z-score.
Also don't use it with Chinese stocks as the balance sheets are too unreliable:eek:
There have been numerous tests of the effectiveness of the Altman Z-score over the years. Morgan Stanley did an interesting study in 2009.