This week, the overall grades of 3 Airlines stocks are lower, according to the Portfolio Grader database. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

This week, Southwest Airlines Co. (LUV) drops from a C to a D rating. Southwest Airlines Co. is a passenger airline operating in the United States. For more information, get Portfolio Grader’s complete analysis of LUV stock.

China Southern Airlines Company Limited Sponsored ADR Class H (ZNH) slips from a C to a D this week. China Southern Airlines Company Limited Sponsored ADR Class H provides commercial airline services in the People’s Republic of China, Hong Kong, Macau, Taiwan, and internationally. For more information, get Portfolio Grader’s complete analysis of ZNH stock.

China Eastern Airlines Corporation Limited Sponsored ADR Class H (CEA) experiences a ratings drop this week, going from last week’s C to a D. China Eastern Airlines Corporation Limited Sponsored ADR Class H operates in the civil aviation industry providing passenger, cargo, mail delivery, and other transportation services. For more information, get Portfolio Grader’s complete analysis of CEA stock.

Louis Navellier’s proprietary Portfolio Grader stock ranking system assesses roughly 5,000 companies every week based on a number of fundamental and quantitative measures. Stocks are given a letter grade based on their results — with A being “strong buy,” and F being “strong sell.” Explore the tool here.