Southwest Airlines Co
All units in Millions or Millions USD	2000	2001	2002	2003	2004	2005	2006	2007	2008	2009	2010	2011	2012	2013	2014	2015	2016	2017	2018*	2019	2020
Income Statement
Passenger Revenue	5,468	5,379	5,341	5,741	6,280	7,279	8,750	9,457	10,549	9,892	11,489	14,735	16,093	16,721	17,658	18,299	18,594	19,141	20,455	20,776	7,665
Regional Affiliate Revenue
Total Revenue	5,650	5,555	5,522	5,937	6,530	7,584	9,086	9,861	11,023	10,350	12,104	15,658	17,088	17,699	18,605	19,820	20,425	21,171	21,965	22,428	22,428
Wages Salaries & Benefits	1,684	1,856	1,993	2,224	2,578	2,782	3,052	3,213	3,340	3,468	3,704	4,371	4,749	5,035	5,434	6,383	6,798	7,319	7,649	8,293	6,811
Aircraft Fuel Expense	804	771	762	830	1,000	1,341	2,138	2,536	3,713	3,044	3,620	5,644	355	5,763	5,293	3,616	3,647	3,940	4,616	4,347	1,849
Depreciation & Amortization	281	318	356	384	431	469	515	555	599	616	628	715	844	867	938	1,015	1,221	1,218	1,201	1,219	1,255
Net Interest Expense	30	27	69	67	67	75	44	75	104	173	155	184	140	125	123	112	98	79	62	28	317
Operating Expense	4,628	4,924	5,181	5,558	6,126	6,859	8,152	9,070	10,574	10,088	11,116	14,965	16,465	16,421	16,380	15,704	16,665	17,656	18,759	19,471	12,864
Operating Income (Loss)	1,022	631	341	379	404	725	934	791	449	262	988	693	623	1,278	2,225	4,116	3,760	3,515	3,206	2,957	(3,816)
Pretax Income (Loss)	1,018	828	317	604	339	779	790	1,058	278	164	745	323	685	1,209	1,816	3,479	3,547	3,251	3,164	2,957	(4,256)
Net Income (Loss)	626	511	188	372	215	484	499	645	178	99	459	178	421	754	1,136	2,181	2,244	3,488	2,465	2,300	(3,074)
Balance Sheet Asset
Cash & Short-term Investment	523	2,279	1,815	1,865	1,305	2,531	1,759	2,779	1,803	2,593	3,538	3,144	2,970	3,152	2,988	3,051	3,305	3,273	3,689	4,072	13,334
Restricted Cash & Short-term Investments
Total Current Assets	832	2,520	2,232	2,313	2,172	3,620	2,601	4,443	2,893	3,358	4,279	4,345	4,227	4,456	4,404	4,024	4,498	4,815	5,028	5,974	15,173
Total Assets	6,670	8,997	8,766	9,693	11,137	14,003	13,460	16,772	14,308	14,269	15,463	18,068	18,596	19,345	20,200	21,312	23,286	25,110	26,243	25,895	34,588
Balance Sheet Liabilities
Air Traffic Liability	377	450	412	462	529	649	799	931	963	1,044	1,198	1,836	2,170	2,571	2,897	2,990	3,115	3,460	4,134	4,457	3,790
Current Liability	1,298	2,239	1,434	1,723	2,142	3,848	2,887	4,838	2,806	2,676	3,305	4,533	4,650	5,676	5,923	7,406	6,844	6,905	7,905	8,952	7,506
Long-term Debt & Capital Lease Obligations, Less Current Maturities	761	1,327	1,553	1,332	1,700	1,394	1,567	2,050	3,498	3,325	2,875	3,107	2,883	2,191	2,434	2,541	2,821	3,320	2,771	1,846	3,343
Pension & Post Retirement Benefits
Retained Earnings (Accumulated deficit)	2,902	3,228	3,455	3,883	4,089	4,018	4,307	4,788	4,919	4,983	5,399	5,395	5,768	6,431	7,416	9,409	11,418	14,621	15,967	17,945	14,777
Total Stockholder Equity (deficit)	3,451	4,014	4,374	5,029	5,527	6,675	6,449	6,941	4,953	5,466	6,237	6,877	6,992	7,336	6,775	7,358	8,441	10,430	9,853	9,832	8,876
Cash Flow Statement
Net Cash Provided by (Used in) Operating Activity	1,298	1,485	520	1,336	1,066	2,118	1,406	2,845	(1,521)	985	1,561	1,385	2,064	2,477	2,902	3,238	4,293	3,929	4,893	3,987	(1,127)
Net Cash Provided by (Used in) Investing Activities	(1,135)	(998)	(603)	(1,619)	(1,658)	(1,146)	(1,495)	(1,529)	(978)	(1,569)	(1,265)	(1,051)	(803)	(1,384)	(1,727)	(1,913)	(2,272)	(2,408)	(2,038)	(303)	(16)
Net Cash Provided by (Used in) Financing activities	(59)	1,270	(382)	(48)	156	260	(801)	(493)	1,654	330	(149)	(766)	(947)	(851)	(1,248)	(1,024)	(1,924)	(1,706)	(2,496)	(2,990)	9,658
Payments on Long-term Debt and Capital Lease Obligation	(10)	(111)	(65)	(130)	(207)	(149)	(607)	(122)	(55)	(86)	(155)	(557)	(578)	(313)	(561)	(213)	(523)	(592)	(342)	(615)	(839)
Proceeds from Issuance of Long-term Debt	0	614	385	0	520	300	300	500	1,000	455	0	0	0	0	300	500	515	600	0	0	5,622
Net Increase (Decrease) in Cash	104	1,757	(465)	(331)	(436)	1,232	(890)	823	(845)	(254)	147	(432)	284	242	(73)	301	97	(185)	359	694	8,515
Operating Statistics
Regional Passengers
Regional ASM
Regional RPM
Mainline Passengers	(0)	64	63	66	71	78	84	89	89	86	88	104	109	108	110	118	125	130	133	131	54
Mainline ASM	59,910	65,295	68,887	71,790	76,861	85,173	92,663	99,636	103,271	98,002	98,437	120,579	128,137	130,344	131,004	140,501	148,522	153,811	159,795	157,254	103,456
Mainline RPM	42,215	44,494	45,392	47,943	53,418	60,223	67,691	72,319	73,492	74,457	78,047	97,583	102,875	104,348	108,035	117,500	124,798	129,041	133,322	131,345	54,221
Data Source:  SEC 10K Filings
*Note: In 2018, many airlines changed their accounting principles to conform to new standards, which lead to some significant changes in the numbers reported compared to previous years. For the sake of clarity, many airlines provided recast 2017 results in their 10-K reports that can be found in SEC’s EDGAR tool.