Listed below is the Statement of Cash Flows for Southwest Airlines

For the years ended December 31,	2019		2018	2017
CASH FLOWS FROM (FOR) OPERATING ACTIVITIES
Net income (loss)	$	459	$ 178	$	99
Depreciation expense		628	715		616
(Increase) decrease in accounts receivable		(26)	(26)		40
(Increase) decrease in other current assets		49	65		85
Increase (decrease)in payables		193	253		59
Other operating changes, net		258	200		86
Net cash from operating activities (NCOA)		1,561	1,385		985
CASH FLOWS (FOR) INVESTING ACTIVITIES
Purchase of property, plant, and equipment,		(493)	(968)		(585)
Purchase of investments		(5,624)	(5,362)		(6,106)
Proceeds from the sale of investments		4,852	5,314		5,120
Other investing changes, net		-	(35)		2
Net cash (for) investing activities (NCIA)		(1,265)	(1,051)		(1,569)
CASH FLOWS FROM (FOR) FINANCING ACTIVITIES
Issuance of long-term debt		0	0		455
Issuance of capital stock		55	39		20
Repayment of long-term debt		(155)	(577)		(86)
Repurchase of capital stock		0	(225)		0
Payment of dividends		(13)	(14)		(13)
Other financing changes, net		(36)	11		(46)
Net cash from financing activities (NCFA)		(149)	(766)		330
Net change in cash		147	(432)		(254)
+ Beginning cash and cash equivalents		1,114	1,261		1,368
= Ending cash and cash equivalents	$	1,261	$ 829	$	1,114

Required: Calculate the Free Cash Flow for each year