Use the $2019$ Form $10-$K for Southwest Airlines to complete the requirements below. To obtain the Form $10-$K you can use either the EDGAR system $($see instructions in Appendix A at the back of this text$),$ or it can be found under "Investor Relations," which is under the "About Southwest" link on the company's corporate website, www$.$southwest.com. The company includes its Form $10-$K as a part of its $2019$ Annual Report. Be sure to read carefully the "Item $6.$ Selected Financial Data" section of the document.