Delta financial analysis

1.What are some of the key financial ratios to look at to determine Delta airline’s (NYSE: DAL)long term profitability? Please list the top 3 ratios, their formula and the reason you think they are important. Then, calculate these ratios for Delta Airline.
2. What are some of the key risks and benefits of investing in Delta Airline? Please provide your reason.
All info can be find on 10K (SEC EDGAR), no need for citation.

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