This week, the overall grades of 4 Airlines stocks are lower, according to the Portfolio Grader database. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

This week, Ryanair Holdings Plc Sponsored ADR (RYAAY) drops from a C to a D rating. Ryanair Holdings Plc Sponsored ADR provides low fare passenger airline services to destinations in Europe. The company also gets F’s in earnings momentum. For more information, get Portfolio Grader’s complete analysis of RYAAY stock.

This is a rough week for American Airlines Group, Inc. (AAL). The company’s rating falls to D from the previous week’s C. The company also gets F’s in earnings momentum. For more information, get Portfolio Grader’s complete analysis of AAL stock.

China Southern Airlines Company Limited Sponsored ADR Class H (ZNH) is having a tough week. The company’s rating falls from a C to a D. 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’s (CEA) rating weakens this week, dropping to a D versus last week’s C. China Eastern Airlines Corporation Limited Sponsored ADR Class H operates in the civil aviation industry providing passenger, cargo, mail delivery, and other transportation services. The company also gets F’s in earnings growth. 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.