($ Millions)	JetBlue Airways	Southwest Airlines
Total liabilities, 2017	$ 1,108	$ 13,973
Total liabilities, 2016	$ 1,444	$ 14,845
Total assets, 2017	$ 9,781	$ 25,110
Total current assets, 2017	$ 1,206	$ 4,815
Total assets, 2016	$ 9,323	$ 23,386
Total current assets, 2016	$ 1,403	$ 4,498
Revenue, 2017	$ 7,015	$ 21,171
Net income, 2017	$ 1,147	$ 3,488

(Please show calculations so I know how to do it)

a.) Compute the return on equity ratio for JetBlue and Southwest for 2017. Which Company earned the higher return for its shareholders?

b.) Compute the debt-to-equity ratio for each company as of December 31, 2017. Which company relies more on creditor financing?