Analysts have expressed a cautious outlook for Delta Air Lines, highlighting several areas of concern. The airline's performance in revenue passenger miles has reportedly been lagging behind its competitors. This, combined with Wall Street estimates pointing to a modest revenue growth of 3.9% for the next year, suggests a potential for soft demand in the near future. Furthermore, Delta's free cash flow margin over the last two years, standing at 3.6%, has been described as poor. This limited cash flow could constrain the company's ability to fund growth initiatives, execute stock buybacks, or increase dividends, according to the analysis. The commentary points to these financial metrics as reasons for potential investors to be hesitant about the stock. No significant market reaction to this analysis was reported.