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FINANCIAL DERIVATIVE INSTRUMENTS (Tables)
3 Months Ended
Mar. 31, 2012
Notes to Financial Statements [Abstract]  
Volume of fuel hedging
  Fuel hedged as of
  March 31, 2012
Period (by year) (gallons in millions)
Remainder of 2012  313
2013  886
2014  330
2015  336
Schedule of derivative instruments in statement of financial position, fair value
    Asset derivatives  Liability derivatives
 Balance Sheet Fair value at  Fair value at  Fair value at Fair value at
(in millions) location 03/31/12 12/31/11 03/31/12 12/31/11
              
Derivatives designated as hedges*             
Fuel derivative contracts (gross)Other current assets $ 171 $ 17 $ 8 $ -
Fuel derivative contracts (gross)Other assets   361   542   53   107
Fuel derivative contracts (gross)Accrued liabilities   24   97   -   8
Fuel derivative contracts (gross)Other noncurrent liabilities   51   93   6   24
Interest rate derivative contractsOther assets   58   64   -   -
Interest rate derivative contractsAccrued liabilities   -   2   -   -
Interest rate derivative contractsOther noncurrent liabilities   -   -   123   132
              
Total derivatives designated as hedges  $ 665 $ 815 $ 190 $ 271
              
Derivatives not designated as hedges*             
Fuel derivative contracts (gross)Other current assets $ 452 $ 124 $ 448 $ 58
Fuel derivative contracts (gross)Other assets   400   26   557   272
Fuel derivative contracts (gross)Accrued liabilities   135   326   284   687
Fuel derivative contracts (gross)Other noncurrent liabilities   21   9   75   122
              
Total derivatives not designated as hedges  $ 1,008 $ 485 $ 1,364 $ 1,139
              
Total derivatives  $ 1,673 $ 1,300 $ 1,554 $ 1,410
              
* Represents the position of each trade before consideration of offsetting positions with each counterparty and does not include the impact of cash collateral deposits provided to or received from counterparties. See discussion of credit risk and collateral following in this Note.
Cash collateral deposits, due to/from third parties, and net unrealized gains/losses
   Balance Sheet March 31, December 31,
(in millions) location 2012 2011
Cash collateral deposits provided Offset against Other      
 to counterparties - noncurrent noncurrent liabilities $ - $ 41
Cash collateral deposits provided Offset against Accrued      
 to counterparties - current liabilities   85   185
Due to third parties for fuel contracts Accrued liabilities   25   21
Receivable from third parties for Accounts and other      
 fuel contracts receivables   1   3
Derivatives in cash flow hedging relationships
Derivatives in cash flow hedging relationships
  (Gain) loss  (Gain) loss (Gain) loss
  recognized in AOCI on  reclassified from AOCI recognized in income
  derivatives (effective  into income (effective on derivatives
  portion)   portion)(a)  (ineffective portion) (b)
  Three months ended Three months ended Three months ended
  March 31, March 31, March 31,
(in millions)2012 2011 2012 2011 2012 2011
                   
Fuel derivative                 
 contracts$ (136)*$ (315)*$ 23*$ 16*$ 32 $ 34
Interest rate                 
 derivatives  (6)*  (7)*  -   -   -   -
                   
Total$ (142) $ (322) $ 23 $ 16 $ 32 $ 34
                   
*Net of tax
(a) Amounts related to fuel derivative contracts and interest rate derivatives are included in Fuel and oil and Interest expense, respectively.
(b) Amounts are included in Other (gains) losses, net.
Derivatives not in cash flow hedging relationships
Derivatives not in cash flow hedging relationships 
          
  (Gain) loss   
  recognized in income on   
   derivatives   
  Three months ended Location of (gain) loss 
  March 31, recognized in income 
(in millions) 2012 2011 on derivatives 
          
Fuel derivative contracts $ (208) $ (5) Other (gains) losses, net 
Fair values of fuel derivatives, amounts posted as collateral, and collateral posting threshold amounts
  Counterparty (CP)    
  A B C D E Other(a) Total
(in millions)              
Fair value of fuel derivatives$67 $(71) $(21) $51 $159 $(1) $ 184
Cash collateral held from (by) CP  -  (85)  -  -  -  -  (85)
If credit rating is investment              
grade, fair value of fuel              
derivative level at which:              
Cash is provided to CP (40) to (340) 0 to (125) >(50) >(75) >(50)    
  or >(740) or >(625)          
Cash is received from CP >75 >150 >200(c) >125(c) >250    
Aircraft or cash can be pledged              
to CP as collateral (340) to  (125) to  N/A N/A N/A    
  (740)(d) (625)(d)          
If credit rating is non-investment              
grade, fair value of fuel derivative              
level at which:              
Cash is provided to CP (40) to (340) 0 to (125)  (b)  (b)  (b)    
  or >(740) or >(625)          
Cash is received from CP  (b)  (b)  (b)  (b)  (b)    
Aircraft can be pledged to CP              
as collateral (340) to  (125) to  N/A N/A N/A    
  (740) (625)          
               
(a) Individual counterparties with fair value of fuel derivatives <$15 million.
(b) Cash collateral is provided at 100 percent of fair value of fuel derivative contracts.
(c) Thresholds may vary based on changes in credit ratings within investment grade.
(d) The Company has the option of providing cash or pledging aircraft as collateral. No aircraft were pledged as collateral with such counterparty as of March 31, 2012.