In January 2022, United Airlines (UAL) had a market capitalization of \($14.3\) billion, debt of \($39.4\) billion, and cash of \($18.4\) billion. United Airlines had revenues of \($24.6\) billion.

Southwest Airlines (LUV) had a market capitalization of \($26.1\) billion, debt of \($12.3\) billion, cash of \($15.5\) billion, and revenues of \($15.8\) billion.

a. Compare the market capitalization-to-revenue ratio (also called the price-to-sales ratio) for United Airlines and Southwest Airlines.

b. Compare the enterprise value-to-revenue ratio for United Airlines and Southwest Airlines.

c. Which of these comparisons is more meaningful? Explain.