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Disclosure - Basis of Presentation and Summary of Significant Accounting Policies link:calculationLink link:presentationLink link:definitionLink 1011 - Disclosure - Special Items, Net link:calculationLink link:presentationLink link:definitionLink 1012 - Disclosure - Earnings Per Common Share link:calculationLink link:presentationLink link:definitionLink 1013 - Disclosure - Share Repurchase Programs and Dividends link:calculationLink link:presentationLink link:definitionLink 1014 - Disclosure - Debt link:calculationLink link:presentationLink link:definitionLink 1015 - Disclosure - Income Taxes link:calculationLink link:presentationLink link:definitionLink 1016 - Disclosure - Risk Management link:calculationLink link:presentationLink link:definitionLink 1017 - Disclosure - Fair Value Measurements link:calculationLink link:presentationLink link:definitionLink 1018 - Disclosure - Employee Benefit Plans link:calculationLink link:presentationLink link:definitionLink 1019 - Disclosure - Accumulated Other Comprehensive Income (Loss) link:calculationLink link:presentationLink link:definitionLink 1020 - 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Disclosure - Basis of Presentation and Summary of Significant Accounting Policies - Summary of Depreciable Asset (Detail) link:calculationLink link:presentationLink link:definitionLink 1047 - Disclosure - Basis of Presentation and Summary of Significant Accounting Policies - Schedule of Amortizable Intangible Assets (Detail) link:calculationLink link:presentationLink link:definitionLink 1048 - Disclosure - Basis of Presentation and Summary of Significant Accounting Policies - Schedule of Future Amortization Expense (Detail) link:calculationLink link:presentationLink link:definitionLink 1049 - Disclosure - Basis of Presentation and Summary of Significant Accounting Policies - Components of Regional Expenses (Detail) link:calculationLink link:presentationLink link:definitionLink 1050 - Disclosure - Basis of Presentation and Summary of Significant Accounting Policies - Components of Regional Expenses (Parenthetical) (Detail) link:calculationLink link:presentationLink link:definitionLink 1051 - Disclosure - Special Items - Components of Company's Special Items, Net Included in Consolidated Statements of Operations (Detail) link:calculationLink link:presentationLink link:definitionLink 1052 - Disclosure - Special Items - Additional Disclosures (Detail) link:calculationLink link:presentationLink link:definitionLink 1053 - Disclosure - Earnings (Loss) per Share - Computation of Basic and Diluted Earnings per Common Share (Detail) link:calculationLink link:presentationLink link:definitionLink 1054 - Disclosure - Earnings (Loss) per Share - Computation of Basic and Diluted Earnings per Common Share (Parenthetical) (Detail) link:calculationLink link:presentationLink link:definitionLink 1055 - Disclosure - Share Repurchase Programs and Dividends - Share Repurchase Programs (Detail) link:calculationLink link:presentationLink link:definitionLink 1056 - Disclosure - Share Repurchase Programs and Dividends - Dividends (Detail) link:calculationLink link:presentationLink link:definitionLink 1057 - Disclosure - Debt - Components of Long-Term Debt (Detail) link:calculationLink link:presentationLink link:definitionLink 1058 - Disclosure - Debt - Summary of Availability under Revolving Credit Facilities (Detail) link:calculationLink link:presentationLink link:definitionLink 1059 - Disclosure - Debt - Additional Information (Detail) link:calculationLink link:presentationLink link:definitionLink 1060 - Disclosure - Debt - Schedule of Maturities of Long-Term Debt and Capital Leases (Detail) link:calculationLink link:presentationLink link:definitionLink 1061 - Disclosure - Debt - Components of Long-Term Debt - 2013, 2014 and 2016 Credit Facilities (Detail) link:calculationLink link:presentationLink link:definitionLink 1062 - Disclosure - Debt - Components of Long-Term Debt - 2013, 2014 and 2016 Credit Facilities (Parenthetical) (Detail) link:calculationLink link:presentationLink link:definitionLink 1063 - Disclosure - Debt - 2013, 2014 and 2016 Credit Facilities (Detail) link:calculationLink link:presentationLink link:definitionLink 1064 - Disclosure - Debt - Components of Long-Term Debt - 2016-1 Enhanced Equipment Trust Certificates (Detail) link:calculationLink link:presentationLink link:definitionLink 1065 - Disclosure - Debt - Details of 2016-1 Enhanced Equipment Trust Certificates (Detail) link:calculationLink link:presentationLink link:definitionLink 1066 - Disclosure - Debt - Components of Long-Term Debt - 2016-2 Enhanced Equipment Trust Certificates (Detail) link:calculationLink link:presentationLink link:definitionLink 1067 - Disclosure - Debt - Details of 2016-2 Enhanced Equipment Trust Certificates (Detail) link:calculationLink link:presentationLink link:definitionLink 1068 - Disclosure - Debt - Components of Long-Term Debt - 2016-3 Enhanced Equipment Trust Certificates (Detail) link:calculationLink link:presentationLink link:definitionLink 1069 - Disclosure - Debt - Details of 2016-3 Enhanced Equipment Trust Certificates (Detail) link:calculationLink link:presentationLink link:definitionLink 1070 - Disclosure - Debt - Components of Long-Term Debt - Equipment Loans and Other Notes Payable Issued in 2016 (Detail) link:calculationLink link:presentationLink link:definitionLink 1071 - Disclosure - Debt - Components of Long-Term Debt - Special Facility Revenue Bonds (Detail) link:calculationLink link:presentationLink link:definitionLink 1072 - Disclosure - Debt - Details of Senior Notes (Detail) link:calculationLink link:presentationLink link:definitionLink 1073 - Disclosure - Debt - Components of Long-Term Debt - Senior Notes (Detail) link:calculationLink link:presentationLink link:definitionLink 1074 - Disclosure - Debt - Components of Long-Term Debt - Guarantees (Detail) link:calculationLink link:presentationLink link:definitionLink 1075 - Disclosure - Debt - Schedule of Collateral Coverage Tests (Detail) link:calculationLink link:presentationLink link:definitionLink 1076 - Disclosure - Income Taxes - Components of Income Tax Provision (Benefit) (Detail) link:calculationLink link:presentationLink link:definitionLink 1077 - 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Disclosure - Employee Benefit Plans - Additional Information (Detail) link:calculationLink link:presentationLink link:definitionLink 1085 - Disclosure - Employee Benefit Plans - Schedule of Changes in Projected Benefit Obligations (Detail) link:calculationLink link:presentationLink link:definitionLink 1086 - Disclosure - Employee Benefit Plans - Schedule of Changes in Fair Value of Plan Assets (Detail) link:calculationLink link:presentationLink link:definitionLink 1087 - Disclosure - Employee Benefit Plans - Schedule of Changes in Fair Value of Plan Assets (Parenthetical) (Detail) link:calculationLink link:presentationLink link:definitionLink 1088 - Disclosure - Employee Benefit Plans - Schedule of Amounts Recognized in Consolidated Balance Sheets (Detail) link:calculationLink link:presentationLink link:definitionLink 1089 - Disclosure - Employee Benefit Plans - Schedule of Amounts Recognized in Other Comprehensive Income (Detail) link:calculationLink link:presentationLink link:definitionLink 1090 - Disclosure - Employee Benefit Plans - Schedule of Amounts Recognized in Consolidated Balance Sheets (Parenthetical) (Detail) link:calculationLink link:presentationLink link:definitionLink 1091 - Disclosure - Employee Benefit Plans - Schedule of Accumulated Benefit Obligations Exceeding Fair Value of Plan Assets (Detail) link:calculationLink link:presentationLink link:definitionLink 1092 - Disclosure - Employee Benefit Plans - Components of Net Periodic Benefit Cost (Income) (Detail) link:calculationLink link:presentationLink link:definitionLink 1093 - Disclosure - Employee Benefit Plans - Components of Net Periodic Benefit Cost (Income) (Parenthetical) (Detail) link:calculationLink link:presentationLink link:definitionLink 1094 - Disclosure - Employee Benefit Plans - Schedule of Assumption Used to Determine Benefit Obligations (Detail) link:calculationLink link:presentationLink link:definitionLink 1095 - Disclosure - Employee Benefit Plans - Schedule of Assumption Used to Determine Benefit Obligations (Parenthetical) (Detail) link:calculationLink link:presentationLink link:definitionLink 1096 - Disclosure - Employee Benefit Plans - Schedule of One Percentage Point Change in Assumed Health Care Cost Trend Rates (Detail) link:calculationLink link:presentationLink link:definitionLink 1097 - Disclosure - Employee Benefit Plans - Schedule of Expected Future Service Benefit Payments (Detail) link:calculationLink link:presentationLink link:definitionLink 1098 - Disclosure - Employee Benefit Plans - Schedule of Allocation of Plan Assets (Detail) link:calculationLink link:presentationLink link:definitionLink 1099 - Disclosure - Employee Benefit Plans - Schedule of Fair Value of Pension Plan Assets by Asset Category (Detail) link:calculationLink link:presentationLink link:definitionLink 1100 - Disclosure - Employee Benefit Plans - Schedule of Fair Value of Pension Plan Assets by Asset Category (Parenthetical) (Detail) link:calculationLink link:presentationLink link:definitionLink 1101 - Disclosure - Employee Benefit Plans - Changes in Fair Value Measurements of Level 3 Investments (Detail) link:calculationLink link:presentationLink link:definitionLink 1102 - Disclosure - Employee Benefit Plans - Fair Values of Retiree Medical and Other Postretirement Benefit Plans Assets by Asset Category (Detail) link:calculationLink link:presentationLink link:definitionLink 1103 - Disclosure - Accumulated Other Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Income (Loss) (Detail) link:calculationLink link:presentationLink link:definitionLink 1104 - Disclosure - Accumulated Other Comprehensive Income (Loss) - Reclassifications out of Accumulated Other Comprehensive Income (Loss) (Detail) link:calculationLink link:presentationLink link:definitionLink 1105 - Disclosure - Commitments, Contingencies and Guarantees - Long-term Purchase Commitments (Detail) link:calculationLink link:presentationLink link:definitionLink 1106 - Disclosure - Commitments, Contingencies and Guarantees - Long-term Purchase Commitments (Parenthetical) (Detail) link:calculationLink link:presentationLink link:definitionLink 1107 - Disclosure - Commitments, Contingencies and Guarantees - Unrecorded Unconditional Purchase Obligations (Detail) link:calculationLink link:presentationLink link:definitionLink 1108 - Disclosure - Commitments, Contingencies and Guarantees - Additional Information (Detail) link:calculationLink link:presentationLink link:definitionLink 1109 - Disclosure - Commitments, Contingencies and Guarantees - Unrecorded Unconditional Purchase Obligations (Parenthetical) (Detail) link:calculationLink link:presentationLink link:definitionLink 1110 - Disclosure - Commitments, Contingencies and Guarantees - Future Minimum Operating Lease Payments (Detail) link:calculationLink link:presentationLink link:definitionLink 1111 - Disclosure - Supplemental Cash Flow Information - Cash Flow Information and Non-Cash Investing and Financing Activities (Detail) link:calculationLink link:presentationLink link:definitionLink 1112 - Disclosure - Operating Segments and Related Disclosures - Additional Information (Detail) link:calculationLink link:presentationLink link:definitionLink 1113 - Disclosure - Operating Segments and Related Disclosures - Operating Revenues by Geographic Region (Detail) link:calculationLink link:presentationLink link:definitionLink 1114 - Disclosure - Share Based Compensation - Additional Information (Detail) link:calculationLink link:presentationLink link:definitionLink 1115 - Disclosure - Share Based Compensation - Schedule of Stock-Settled RSU Award Activity (Detail) link:calculationLink link:presentationLink link:definitionLink 1116 - Disclosure - Share Based Compensation - Stock Option and Stock-Settled SAR Award Activity for All Plans (Detail) link:calculationLink link:presentationLink link:definitionLink 1117 - Disclosure - Share Based Compensation - Cash-Settled SAR Award Activity for All Plans (Detail) link:calculationLink link:presentationLink link:definitionLink 1118 - Disclosure - Valuation and Qualifying Accounts - Components of Valuation and Qualifying Accounts (Detail) link:calculationLink link:presentationLink link:definitionLink 1119 - Disclosure - Quarterly Financial Data - Summarized Financial Data (Detail) link:calculationLink link:presentationLink link:definitionLink 1120 - Disclosure - Quarterly Financial Data - Additional Information (Detail) link:calculationLink link:presentationLink link:definitionLink 1121 - Disclosure - Subsequent Events - Additional Information (Detail) link:calculationLink link:presentationLink link:definitionLink 1122 - Disclosure - Transactions with Related Parties (Detail) link:calculationLink link:presentationLink link:definitionLink 1123 - Disclosure - Transactions with Related Parties - Additional Information (Detail) link:calculationLink link:presentationLink link:definitionLink