Notes to Consolidated Financial Statements

Note 1 - Summary of Significant Accounting Policies Note 2 - Segment Information Note 3 - Earnings Per Share Note 4 - Employee and Retiree Benefits Note 5 - Investments Held by VEBA Trust Note 6 - Former Natural Resource Operations Note 7 - Costs Associated With Exit Activities Note 8 - Property and Equipment Note 9 - Impairment of Long-Lived Assets Note 10 - Other Assets Note 11 - Accrued Liabilities Note 12 - Other Liabilities Note 13 - Long-Term Debt Note 14 - Accounts Receivable and Asset Securitization Note 15 - Operating Leases Note 16 - Equity-Based Compensation Plans Note 17 - Capital Stock Note 18 - Income Taxes Note 19 - Supplemental Cash Flow Information Note 20 - Other Operating Income, Net Note 21 - Other Nonoperating Income (Expense), Net Note 22 - Risk Management Note 23 - Other Commitments and Contingencies Note 24 - Selected Quarterly Financial Data (unaudited)

Note 12 - Other Liabilities

(a) See note 4.
(b) Aircraft lease turnback obligations represent amounts estimated to be paid at the end of the lease term related to heavy maintenance.