0000001 - Document - Cover link:presentationLink link:calculationLink link:definitionLink 0000002 - Document - Audit Information link:presentationLink link:calculationLink link:definitionLink 9952151 - Statement - Consolidated Balance Sheets link:presentationLink link:calculationLink link:definitionLink 9952152 - Statement - Consolidated Balance Sheets (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 9952153 - Statement - Consolidated Statements of Operations link:presentationLink link:calculationLink link:definitionLink 9952154 - Statement - Consolidated Statements of Operations (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 9952155 - Statement - Consolidated Statements of Stockholders' Equity link:presentationLink link:calculationLink link:definitionLink 9952156 - Statement - Consolidated Statements of Cash Flows link:presentationLink link:calculationLink link:definitionLink 9952157 - Disclosure - Summary of Significant Accounting Policies link:presentationLink link:calculationLink link:definitionLink 9952158 - Disclosure - Capacity Purchase Agreement with American link:presentationLink link:calculationLink link:definitionLink 9952159 - Disclosure - Income Taxes link:presentationLink link:calculationLink link:definitionLink 9952160 - Disclosure - Long-term Promissory Note link:presentationLink link:calculationLink link:definitionLink 9952161 - Disclosure - Lease Obligations link:presentationLink link:calculationLink link:definitionLink 9952162 - Disclosure - Sales-type Lease link:presentationLink link:calculationLink link:definitionLink 9952163 - Disclosure - Commitments and Contingencies link:presentationLink link:calculationLink link:definitionLink 9952164 - Disclosure - Retirement and Other Benefit Plans link:presentationLink link:calculationLink link:definitionLink 9952165 - Disclosure - Related-Party Transactions link:presentationLink link:calculationLink link:definitionLink 9952166 - Disclosure - Collective Bargaining Agreements link:presentationLink link:calculationLink link:definitionLink 9952167 - Disclosure - Income (Loss) Per Share and Equity link:presentationLink link:calculationLink link:definitionLink 9952168 - Disclosure - Supplemental Cash Flow Information link:presentationLink link:calculationLink link:definitionLink 9952169 - Disclosure - Intangible Assets link:presentationLink link:calculationLink link:definitionLink 9952170 - Disclosure - Stock Repurchase Program link:presentationLink link:calculationLink link:definitionLink 9952171 - Disclosure - Subsequent Events link:presentationLink link:calculationLink link:definitionLink 9955511 - Disclosure - Summary of Significant Accounting Policies (Policies) link:presentationLink link:calculationLink link:definitionLink 9955512 - Disclosure - Summary of Significant Accounting Policies (Tables) link:presentationLink link:calculationLink link:definitionLink 9955513 - Disclosure - Income Taxes (Tables) link:presentationLink link:calculationLink link:definitionLink 9955514 - Disclosure - Lease Obligations (Tables) link:presentationLink link:calculationLink link:definitionLink 9955515 - Disclosure - Sales-type Lease (Tables) link:presentationLink link:calculationLink link:definitionLink 9955516 - Disclosure - Collective Bargaining Agreements (Tables) link:presentationLink link:calculationLink link:definitionLink 9955517 - Disclosure - Income (Loss) Per Share and Equity (Tables) link:presentationLink link:calculationLink link:definitionLink 9955518 - Disclosure - Supplemental Cash Flow Information (Tables) link:presentationLink link:calculationLink link:definitionLink 9955519 - Disclosure - Intangible Assets (Tables) link:presentationLink link:calculationLink link:definitionLink 9955520 - Disclosure - Summary of Significant Accounting Policies - Aviation Disposition (Details) link:presentationLink link:calculationLink link:definitionLink 9955521 - Disclosure - Summary of Significant Accounting Policies - Description of Operations, Out-Of-Period Adjustment and Segment Reporting (Details) link:presentationLink link:calculationLink link:definitionLink 9955522 - Disclosure - Summary of Significant Accounting Policies - Contract Revenues (Details) link:presentationLink link:calculationLink link:definitionLink 9955523 - Disclosure - Summary of Significant Accounting Policies - Contract Services and Other Revenues (Details) link:presentationLink link:calculationLink link:definitionLink 9955524 - Disclosure - Summary of Significant Accounting Policies - Restricted Cash (Details) link:presentationLink link:calculationLink link:definitionLink 9955525 - Disclosure - Summary of Significant Accounting Policies - Allowance for Credit Losses (Details) link:presentationLink link:calculationLink link:definitionLink 9955526 - Disclosure - Summary of Significant Accounting Policies - Marketable Securities and Long-Term Restricted Investments and Due from Broker (Details) link:presentationLink link:calculationLink link:definitionLink 9955527 - Disclosure - Summary of Significant Accounting Policies - Schedule of Net Unrealized Gains and Losses That Relate To Marketable Securities and Long-Term Investments (Details) link:presentationLink link:calculationLink link:definitionLink 9955528 - Disclosure - Summary of Significant Accounting Policies - Receivables, net (Details) link:presentationLink link:calculationLink link:definitionLink 9955529 - Disclosure - Summary of Significant Accounting Policies- Schedule of Receivables, Net (Details) link:presentationLink link:calculationLink link:definitionLink 9955530 - Disclosure - Summary of Significant Accounting Policies - Spare Parts and Supplies (Details) link:presentationLink link:calculationLink link:definitionLink 9955531 - Disclosure - Summary of Significant Accounting Policies - Contract Costs and Contract Assets and Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 9955532 - Disclosure - Summary of Significant Accounting Policies - Schedule of Current and Non-Current Contract Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 9955533 - Disclosure - Summary of Significant Accounting Policies - Schedule of Property and Equipment Useful Lives (Details) link:presentationLink link:calculationLink link:definitionLink 9955534 - Disclosure - Summary of Significant Accounting Policies - Property and Equipment (Details) link:presentationLink link:calculationLink link:definitionLink 9955535 - Disclosure - Summary of Significant Accounting Policies - Schedule of Original Cost of Company's Fixed Assets and Accumulated Depreciation or Amortization (Details) link:presentationLink link:calculationLink link:definitionLink 9955536 - Disclosure - Summary of Significant Accounting Policies - Supplemental Executive Savings Plan (Details) link:presentationLink link:calculationLink link:definitionLink 9955537 - Disclosure - Summary of Significant Accounting Policies - Schedule of Other Assets (Details) link:presentationLink link:calculationLink link:definitionLink 9955538 - Disclosure - Summary of Significant Accounting Policies - Other Assets (Details) link:presentationLink link:calculationLink link:definitionLink 9955539 - Disclosure - Summary of Significant Accounting Policies - Interest and Dividend Income and Income Taxes (Details) link:presentationLink link:calculationLink link:definitionLink 9955540 - Disclosure - Summary of Significant Accounting Policies - Concentration of Credit Risk (Details) link:presentationLink link:calculationLink link:definitionLink 9955541 - Disclosure - Summary of Significant Accounting Policies - Schedule of Classification of Marketable Securities And Long Term Investments (Details) link:presentationLink link:calculationLink link:definitionLink 9955542 - Disclosure - Summary of Significant Accounting Policies - Reclassifications (Details) link:presentationLink link:calculationLink link:definitionLink 9955543 - Disclosure - Capacity Purchase Agreement with American (Details) link:presentationLink link:calculationLink link:definitionLink 9955544 - Disclosure - Income Taxes - Schedule of (Benefit) Provision for Income Taxes (Details) link:presentationLink link:calculationLink link:definitionLink 9955545 - Disclosure - Income Taxes - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 9955546 - Disclosure - Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) link:presentationLink link:calculationLink link:definitionLink 9955547 - Disclosure - Income Taxes - Schedule of Income Taxes Paid, Net of Refunds (Details) link:presentationLink link:calculationLink link:definitionLink 9955548 - Disclosure - Income Taxes - Schedule of Components of Deferred Tax Assets and Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 9955549 - Disclosure - Income Taxes - Schedule of Unrecognized Tax Benefits (Details) link:presentationLink link:calculationLink link:definitionLink 9955550 - Disclosure - Long-term Promissory Note (Details) link:presentationLink link:calculationLink link:definitionLink 9955551 - Disclosure - Lease Obligations - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 9955552 - Disclosure - Lease Obligations - Schedule of Weighted average Terms and Discount Rate For Operating Leases (Details) link:presentationLink link:calculationLink link:definitionLink 9955553 - Disclosure - Lease Obligations - Schedule of Component Of Lease Cost (Details) link:presentationLink link:calculationLink link:definitionLink 9955554 - Disclosure - Lease Obligations - Schedule of Future Minimum Lease Payments Under Non-Cancelable Operating Leases (Details) link:presentationLink link:calculationLink link:definitionLink 9955554 - Disclosure - Lease Obligations - Schedule of Future Minimum Lease Payments Under Non-Cancelable Operating Leases (Details) link:presentationLink link:calculationLink link:definitionLink 9955555 - Disclosure - Sales-type Lease - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 9955556 - Disclosure - Sales-type Lease - Schedule of Undiscounted Cash Flows Over Expected Term of Sales-Type Lease (Details) link:presentationLink link:calculationLink link:definitionLink 9955557 - Disclosure - Commitments and Contingencies (Details) link:presentationLink link:calculationLink link:definitionLink 9955558 - Disclosure - Retirement and Other Benefit Plans (Details) link:presentationLink link:calculationLink link:definitionLink 9955559 - Disclosure - Related-Party Transactions (Details) link:presentationLink link:calculationLink link:definitionLink 9955560 - Disclosure - Collective Bargaining Agreements - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 9955561 - Disclosure - Collective Bargaining Agreements - Schedule of Multiemployer Plans (Details) link:presentationLink link:calculationLink link:definitionLink 9955562 - Disclosure - Income (Loss) Per Share and Equity - Schedule of Calculations of Net Income (Loss) Per Common Share (Details) link:presentationLink link:calculationLink link:definitionLink 9955563 - Disclosure - Income (Loss) Per Share and Equity - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 9955564 - Disclosure - Supplemental Cash Flow Information - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 9955565 - Disclosure - Supplemental Cash Flow Information - Schedule of Non-Cash Investing and Financing Activities and Reconciliation of Cash and Cash Equivalents and Restricted Cash (Details) link:presentationLink link:calculationLink link:definitionLink 9955566 - Disclosure - Intangible Assets (Details) link:presentationLink link:calculationLink link:definitionLink 9955567 - Disclosure - Stock Repurchase Program (Details) link:presentationLink link:calculationLink link:definitionLink 9955567 - Disclosure - Stock Repurchase Program (Details) link:presentationLink link:calculationLink link:definitionLink 9955568 - Disclosure - Subsequent Events (Details) link:presentationLink link:calculationLink link:definitionLink