In January $2019,$ United Airlines $($UAL$)$ had a market capitalization of $$22\mathrm{.}51$ billion, debt of $$13\mathrm{.}63$ billion, and cash of $$4\mathrm{.}06$ billion. United Airlines had revenues of $$41\mathrm{.}31$ billion. Southwest Airlines $($LUV$)$ had a market capitalization of $$27\mathrm{.}64$ billion, debt of $$3\mathrm{.}59$ billion, cash of $$3\mathrm{.}65$ billion, and revenues of $$21\mathrm{.}88$ 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.

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

The market capitalization$-$to$-$revenue ratio for United Airlines is $($Round to three decimal places.