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http://investors.southwest.com/~/media/Files/S/Southwest-IR/LUV_2018_Annual%20Report.pdf

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Southwest Airlines Co. (2019, August 23). Stock quote for southwest airlines. Retrieved from

https://www.msn.com/en-us/money/stockdetails/nys-luv/fia1x6rw?symbol=LUV&form=PRTPRQ

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Southwest Airlines Co. (2018, December 31). Southwest airlines co. form 10K. Retrieved from

https://last10k.com/sec-filings/luv#link_fullReport

 

Southwest Airlines Co. (2019). Airline financial ratio. Retrieved from www.yahoofinance.com.

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