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Consolidated Statements of Cash Flows $ in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2017 MXN ($) | Dec. 31, 2016 MXN ($) | Dec. 31, 2015 MXN ($)
Operating activities |  |  |  |
(Loss) income before income tax | $ (38,296) | $ (755,774) | $ 4,976,671 | $ 3,502,218
Non-cash adjustment to reconcile income before tax to net cash flows from operating activities: |  |  |  |
Depreciation and amortization | 27,802 | 548,687 | 536,543 | 456,717
Provision for doubtful accounts | 239 | 4,720 | 9,164 | 8,825
Finance income | (5,361) | (105,795) | (102,591) | (47,034)
Finance cost | 4,376 | 86,357 | 35,116 | 21,703
Net foreign exchange differences | 25,556 | 504,366 | (1,054,333) | (483,329)
Financial instruments | 2,534 | 50,007 | 353,943 | 287,550
Net gain on disposal of rotable spare parts, furniture and equipment and gain on sale of aircraft | (3,292) | (64,978) | (483,565) | (180,433)
Employee benefits | 236 | 4,657 | 3,122 | 2,549
Aircraft and engine lease extension benefit and other benefits from service agreements | (5,096) | (100,580) | (82,178) | (62,122)
Management incentive and long-term incentive plans | 445 | 8,783 | 4,826 | 4,250
Cash flows from operating activities before changes in working capital | 9,143 | 180,450 | 4,196,718 | 3,510,894
Changes in operating assets and liabilities: |  |  |  |
Related parties | (1,221) | (24,091) | 50,706 | 13,749
Other accounts receivable | 7,082 | 139,774 | (157,370) | (52,157)
Recoverable and prepaid taxes | (22,243) | (438,966) | (361,377) | 63,499
Inventories | (2,582) | (50,966) | (80,811) | (23,400)
Prepaid expenses | 36,790 | 726,020 | (1,027,040) | (353,451)
Other assets | 1,112 | 21,941 | 19,540 | 28,758
Guarantee deposits | 2,910 | 57,425 | (1,957,350) | (1,164,911)
Suppliers | 9,936 | 196,082 | 136,178 | 300,447
Accrued liabilities | 14,690 | 289,920 | 499,584 | 272,555
Other taxes and fees payable | 17,887 | 353,014 | 523,524 | 433,863
Unearned transportation revenue | 409 | 8,069 | 196,313 | 536,319
Financial instruments | 6,387 | 126,053 | (450,902) | (637,879)
Other liabilities | 567 | 11,198 | 260,437 | 127,170
Cash flows from operating activities before interest received and income tax paid | 80,867 | 1,595,923 | 1,848,150 | 3,055,456
Interest received | 5,361 | 105,795 | 102,591 | 47,034
Income tax paid | (36,272) | (715,849) | (972,009) | (32,877)
Net cash flows provided by operating activities | 49,956 | 985,869 | 978,732 | 3,069,613
Investing activities |  |  |  |
Acquisitions of rotable spare parts, furniture and equipment | (127,778) | (2,521,752) | (2,198,697) | (1,403,863)
Acquisitions of intangible assets | (6,633) | (130,908) | (60,792) | (52,228)
Pre-delivery payments reimbursements | 10,841 | 213,947 | 1,733,093 | 669,718
Proceeds from disposals of rotable spare parts, furniture and equipment | 9,033 | 178,273 | 498,438 | 185,096
Net cash flows used in investing activities | (114,537) | (2,260,440) | (27,958) | (601,277)
Financing activities |  |  |  |
Proceeds from exercised stock options | 32 | 638 | 20,186 | 23,461
Treasury shares purchase | (512) | (10,108) | (17,025) |
Interest paid | (5,340) | (105,388) | (39,350) | (41,538)
Other finance interest paid |  |  | (137,830) | (40,113)
Payments of financial debt | (46,864) | (924,867) | (1,531,460) | (801,335)
Proceeds from financial debt | 123,535 | 2,438,025 | 1,716,244 | 924,611
Net cash flows provided by financing activities | 70,851 | 1,398,300 | 10,765 | 65,086
Increase in cash and cash equivalents | 6,270 | 123,729 | 961,539 | 2,533,422
Net foreign exchange differences on cash balance | (12,369) | (244,101) | 952,399 | 359,034
Cash and cash equivalents at beginning of year | 358,303 | 7,071,251 | 5,157,313 | 2,264,857
Cash and cash equivalents at end of year | $ 352,204 | $ 6,950,879 | $ 7,071,251 | $ 5,157,313

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- Definition Adjustments for unrealised foreign exchange losses (gains) to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Profit (loss)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2017-01-01 -Paragraph 20 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2017-03-01&anchor=para_20_b&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2017-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2017-03-01&anchor=para_45&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2017-01-01 -Paragraph B13 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2017-03-01&anchor=para_B13_a&doctype=Appendix&seq=2 -URIDate 2017-03-09 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 54 -Subparagraph i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_54_i&doctype=Standard -URIDate 2017-03-09 + Details
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