With the given image, is it weak or strong? Why?

Year Ended December 31, 2018 (a) 2019 2017(a) S 3,011 s 2.123 2.161 882 2.288 175 (153) 186 513 2,165 416 5 162 2,096 35 141 44 17 (20) 263 (33) (252) 438 271 324 222 130 (73) (15) (432) 145 (107) 66 (942) (556) 3.460 (302) 6.879 (293) 6,146 Operating Activities: Net income Adjustments to reconcile net income to net cash provided by operating activities - Deferred income taxes Depreciation and amortization Special charges, non-cash portion Unrealized (gains) losses on investments Other operating activities Changes in operating assets and liabilities (Increase) decrease in receivables Increase in intercompany receivables (Increase) decrease in other assets Increase in advance ticket sales Increase (decrease) in frequent flyer deferred revenue Increase in accounts payable Decrease in advanced purchase of miles Decrease in other liabilities Net cash provided by operating activities Investing Activities: Capital expenditures Purchases of short-term and other investments Proceeds from sale of short-term and other investments Loans made to others Investment in affiliates Other, net Net cash used in investing activities Financing Activities: Proceeds from issuance of long-term debt Payments of long-term debt Dividend to UAL Principal payments under finance leases Capitalized financing costs Other, net Net cash used in financing activities Net increase (decrease) in cash, cash equivalents and restricted cash Cash, cash equivalents and restricted cash at beginning of year Cash, cash equivalents and restricted cash at end of year (4.528) (2.897) 2.996 (174) (36) 79 (4.560) (4,070) (2.552) 2.616 (466) (139) (3.870) (3.241) 3.177 (30) 156 163 (3.803) (4.455) 1.847 (1.240) (1.645) (151) (61) 1.594 (1.727) (1.235) (79) 2.537 (901) (1.844) (84) (80) (1.250) 1.069 1.793 2.862 (1.483) 208 1,585 1.793 (369) (712) 2.297 1,585 $ 493 s $ Investing and Financing Activities Not Affecting Cash: Property and equipment acquired through the issuance of debt Right-of-use assets acquired through operating leases Property and equipment acquired through finance lease Lease modifications and lease conversions Debt associated with termination of a maintenance service agreement Investment in Republic Airways Holdings Inc. received from bankruptcy claims 498 22 143 663 17 S2 163 897 319 16 92 Cash Paid During the Period for. Interest Income taxes $ $ $ 648 29 651 19 571 20 Year Ended December 31, 2018 (a) 2019 2017(a) S 3,011 s 2.123 2.161 882 2.288 175 (153) 186 513 2,165 416 5 162 2,096 35 141 44 17 (20) 263 (33) (252) 438 271 324 222 130 (73) (15) (432) 145 (107) 66 (942) (556) 3.460 (302) 6.879 (293) 6,146 Operating Activities: Net income Adjustments to reconcile net income to net cash provided by operating activities - Deferred income taxes Depreciation and amortization Special charges, non-cash portion Unrealized (gains) losses on investments Other operating activities Changes in operating assets and liabilities (Increase) decrease in receivables Increase in intercompany receivables (Increase) decrease in other assets Increase in advance ticket sales Increase (decrease) in frequent flyer deferred revenue Increase in accounts payable Decrease in advanced purchase of miles Decrease in other liabilities Net cash provided by operating activities Investing Activities: Capital expenditures Purchases of short-term and other investments Proceeds from sale of short-term and other investments Loans made to others Investment in affiliates Other, net Net cash used in investing activities Financing Activities: Proceeds from issuance of long-term debt Payments of long-term debt Dividend to UAL Principal payments under finance leases Capitalized financing costs Other, net Net cash used in financing activities Net increase (decrease) in cash, cash equivalents and restricted cash Cash, cash equivalents and restricted cash at beginning of year Cash, cash equivalents and restricted cash at end of year (4.528) (2.897) 2.996 (174) (36) 79 (4.560) (4,070) (2.552) 2.616 (466) (139) (3.870) (3.241) 3.177 (30) 156 163 (3.803) (4.455) 1.847 (1.240) (1.645) (151) (61) 1.594 (1.727) (1.235) (79) 2.537 (901) (1.844) (84) (80) (1.250) 1.069 1.793 2.862 (1.483) 208 1,585 1.793 (369) (712) 2.297 1,585 $ 493 s $ Investing and Financing Activities Not Affecting Cash: Property and equipment acquired through the issuance of debt Right-of-use assets acquired through operating leases Property and equipment acquired through finance lease Lease modifications and lease conversions Debt associated with termination of a maintenance service agreement Investment in Republic Airways Holdings Inc. received from bankruptcy claims 498 22 143 663 17 S2 163 897 319 16 92 Cash Paid During the Period for. Interest Income taxes $ $ $ 648 29 651 19 571 20