Editor's Note: TheStreet ratings do not represent the views of TheStreet's staff or its contributors. Ratings are established by computer based on metrics for performance (which includes growth, stock performance, efficiency and valuation) and risk (volatility and solvency). Companies with poor cash flow or high debt levels tend to earn lower ratings in our model All three major indices are trading down today with the Dow Jones Industrial Average ( ^DJI) trading down 62 points (-0.4%) at 14,778 as of Wednesday, May 1, 2013, 12:50 PM ET. The NYSE advances/declines ratio sits at 958 issues advancing vs. 1,966 declining with 114 unchanged. The Services sector currently sits down 1.00 versus the S&P 500, which is down 0.42. On the negative front, top decliners within the sector include WEX ( WEX), down 9.45, WEX ( WXS), down 9.45, Amazon.com ( AMZN), down 2.92, MasterCard Incorporated ( MA), down 2.56 and Fiserv ( FISV), down 2.57. Top gainers within the sector include Liberty Media Corporation ( LMCA), up 7.0%, Western Union Company ( WU), up 5.2%, Tim Hortons ( THI), up 4.0%, Comcast ( CMCSK), up 1.6% and CVS Caremark ( CVS), up 1.2%. TheStreet Ratings group would like to highlight 5 stocks pushing the sector lower today: 5. Delta Air Lines ( DAL) is one of the companies pushing the Services sector lower today. As of noon trading, Delta Air Lines is down $0.27 (-1.6%) to $16.87 on average volume Thus far, 7.1 million shares of Delta Air Lines exchanged hands as compared to its average daily volume of 14.0 million shares. The stock has ranged in price between $16.82-$17.55 after having opened the day at $17.26 as compared to the previous trading day's close of $17.14. Delta Air Lines, Inc. provides scheduled air transportation for passengers and cargo in the United States and internationally. Its route network is centered around a system of hub and international gateway airports in Amsterdam, Atlanta, Cincinnati, Detroit, Memphis, Minneapolis-St. Delta Air Lines has a market cap of $14.5 billion and is part of the transportation industry. The company has a P/E ratio of 16.0, below the S&P 500 P/E ratio of 17.7. Shares are up 44.4% year to date as of the close of trading on Tuesday. TheStreet Ratings rates Delta Air Lines as a hold. The company's strengths can be seen in multiple areas, such as its solid stock price performance, revenue growth and good cash flow from operations. However, as a counter to these strengths, we find that the company's profit margins have been poor overall. Get the full Delta Air Lines Ratings Report now. Exclusive Offer: Jim Cramer's 'go-to' small/mid-cap guru Bryan Ashenberg only buys stocks he thinks could return 50-100%. See his top picks for 14-days FREE.