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Delta Air Lines has again earned a spot among the world’s leading brands after being named today as one of Fortune magazine’s Most Admired Companies for the fourth consecutive year.

Among its competitors, Delta was named Fortune’s Most Admired Airline, rated No. 1 on the industry list for the sixth time in the past seven years.

CEO Ed Bastian credited the work of Delta’s 80,000-person workforce for the honor. “It is your unmatched dedication to our customers and unwavering pursuit of excellence in every area of our business that have earned recognition from so many corners. And it is those qualities that will propel us even further,” he wrote in a memo to employees today.

Each year, Fortune surveys top executives and directors across all industries to rank the 10 companies they most admire in nine areas such as innovation, people management and financial soundness, as well as an overall reputation. The magazine’s editors compile the data and publish an annual list of the top 50 Most Admired Companies. Delta is ranked No. 31 among  Most Admired Companies this year.

The airline rankings are based on the results of a global survey of industry executives, boards of directors and analysts who are asked to rate companies in their industry based on criteria including innovation, investment value and global competitiveness.

Most Admired Companies is the latest in a series of accolades for Delta. In December, Delta made a trio of “best workplace” lists: Best Place to Work for LGBT Equality, Best Companies for Diversity and for African-Americans, and Glassdoor’s Best Places to Work.

Bastian told employees he was confident they would continue to raise the bar. “With you taking care of our customers and each other, our best days are yet to come.”

What makes Delta a most admired company?

Companies are ranked by top executives and directors across industries on the following attributes, as well as their overall reputation:

  • Innovation
  • People Management
  • Use of Corporate Assets
  • Quality of Management
  • Social Responsibility
  • Financial Soundness
  • Long-Term Investment Value
  • Quality of Products and Services
  • Global Competitiveness