NEW YORK ( TheStreet) -- Pinnacle Airlines (Nasdaq: PNCL) has been downgraded by TheStreet Ratings from hold to sell. The company's weaknesses can be seen in multiple areas, such as its deteriorating net income, generally weak debt management, disappointing return on equity, poor profit margins and weak operating cash flow. Pinnacle Airlines Corp., through its subsidiaries, operates as an independent regional airline in the United States. It operates an all-regional jet fleet, and provides regional airline capacity to Delta at its hub airports in Atlanta, Detroit, Memphis, and Minneapolis/St. Paul. The company has a P/E ratio of 5.7, equal to the average transportation industry P/E ratio and below the S&P 500 P/E ratio of 23.4. Pinnacle Airlines has a market cap of $129.6 million and is part of the services sector and transportation industry. Shares are down 11.7% year to date as of the close of trading on Thursday. You can view the full Pinnacle Airlines Ratings Report or get investment ideas from our investment research center.