Based on the aggregated intelligence of 180,000-plus investors participating in Motley Fool CAPS, the Fool's free investing community, airline operator Delta Air Lines (NYSE: DAL) has received the dreaded one-star ranking.

With that in mind, let's take a closer look at Delta's business and see what CAPS investors are saying about the stock right now.

Delta facts

Headquarters (founded) Atlanta (1924)
Market Cap $8.9 billion
Industry Airlines
Trailing-12-Month Revenue $35.8 billion
Management CEO Richard Anderson (since 2007)
CFO Hank Halter (since 2008)
Return on Capital (average, past 3 years) 7.8%
Cash/Debt $3.9 billion / $13.5 billion
Competitors AMR
Deutsche Lufthansa
United Continental Holdings

Sources: S&P Capital IQ and Motley Fool CAPS.

On CAPS, 42% of the 930 members who have rated Delta believe the stock will underperform the S&P 500 going forward.

Just last week, one of those Fools, addikt06, cautioned Fools about getting too excited over Delta's recent move into oil refining:

Expensive stock in volatile industry and an even more volatile economy ... also I am not convinced by this massive investment in a refinery -- [in my opinion] this would work out well if a) Delta had the know how to run a refinery b) demand was high ... but in this volatile industry demand is as random as it can get and if I am reading this right the consumer is going to be hurting again so in the short term this stock is going down going down.

If you want to retire rich, you need to protect your portfolio from any undue risk. Luckily, we've found another stock we are incredibly excited about -- excited enough to dub it "The Motley Fool's Top Stock for 2012." We have compiled a special free report for investors to uncover this stock today. The report is 100% free, but it won't be here forever, so click here to access it now.

Want to see how well (or not so well) the stocks in this series are performing? Follow the TrackPoisedTo CAPS account.

Fool contributor Brian Pacampara owns no position in any of the companies mentioned. Try any of our Foolish newsletter services free for 30 days.

We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Fool's disclosure policy always gets a perfect score.