Please refrain from jokes about the mile-high club. What makes Delta (DAL) and other airlines hot are their sizzling stocks.
The airline industry is enjoying a renaissance thanks to consolidation, low fuel prices and rational business plans.
The days of fare wars (and rampant airline bankruptcy filings) are over.
That may not be great news for travelers, but investors are pleased. Delta's stock more than doubled in 2013 and soared nearly 70% last year.
