CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Current Assets
Cash and cash equivalents	$ 35.4	$ 102.2
Marketable securities	1,150.0	1,038.7
Total cash and marketable securities	1,185.4	1,140.9
Receivables - net	169.4	136.4
Inventories and supplies - net	47.8	44.3
Deferred income taxes	152.1	134.2
Fuel hedge contracts	22.0	46.7
Prepaid expenses and other current assets	121.7	93.0
Total Current Assets	1,698.4	1,595.5
Property and Equipment
Aircraft and other flight equipment	4,099.5	4,041.8
Other property and equipment	857.1	762.3
Deposits for future flight equipment	331.4	262.5
Property and Equipment Total	5,288.0	5,066.6
Less accumulated depreciation and amortization	1,740.6	1,665.1
Total Property and Equipment - Net	3,547.4	3,401.5
Fuel Hedge Contracts	39.3	70.2
Other Assets	138.5	127.8
Total Assets	5,423.6	5,195.0
Current Liabilities
Accounts payable	110.8	103.6
Accrued aircraft rent	9.7	31.6
Accrued wages, vacation and payroll taxes	134.7	163.8
Other accrued liabilities	558.5	513.3
Air traffic liability	667.2	489.4
Current portion of long-term debt	183.4	207.9
Total Current Liabilities	1,664.3	1,509.6
Long-Term Debt, Net of Current Portion	957.1	1,099.0
Other Liabilities and Credits
Deferred income taxes	447.5	362.9
Deferred revenue	414.0	410.2
Obligation for pension and postretirement medical benefits	452.9	463.4
Other liabilities	204.8	176.7
Other Liabilities and Credits Totals	1,519.2	1,413.2
Commitments and Contingencies
Shareholders' Equity
Preferred stock, $1 par value Authorized: 5,000,000 shares, none issued or outstanding	0	0
Common stock, $1 par value Authorized: 100,000,000 shares, Issued: 2012 - 70,723,900 shares; 2011 - 75,733,044 shares	70.7	37.9
Capital in excess of par value	674.2	840.0
Treasury stock (common), at cost: 2012 - 0 shares; 2011 - 4,783,494 shares	0	(125.3)
Accumulated other comprehensive loss	(380.8)	(390.0)
Retained earnings	918.9	810.6
Shareholders' Equity Total	1,283.0	1,173.2
Total Liabilities and Shareholders' Equity	$ 5,423.6	$ 5,195.0