----

----

|                                                                                                                                                                                                                                                                                                                                           |   | Year ended December      31, |   |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------|------------------------------|--------|
|                                                                                                                                                                                                                                                                                                                                           |   | 2007                         |   | 2006 |   | 2005 |   | 2004 |   | 2003 |   |
| Earnings:                                                                                                                                                                                                                                                                                                                                      |   |                         |   |   | (As      Adjusted | )a | (AsAdjusted | )a | (AsAdjusted | )a | (AsAdjusted | )a |
| Income before income taxes and      cumulative effect of accounting changea                                                                                                                                                                                                                                                                    |   | $                            | 2,957  |   | $ | 2,996 |   | $ | 2,453 |   | $ | 1,296 |   | $ | 1,241 |   |
| Add:                                                                                                                                                                                                                                                                                                                                           |   |                         |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Interest and other fixed charges,      excluding capitalized interest                                                                                                                                                                                                                                                                          |   |                         | 511    |   |   | 485 |   |   | 437 |   |   | 409 |   |   | 420 |   |
| Reasonable approximation of      portion of rent under long-term operating leases representative of an      interest factor                                                                                                                                                                                                                    |   |                         | 282    |   |   | 261 |   |   | 221 |   |   | 195 |   |   | 182 |   |
| Distributed income of investees      accounted for under the equity method                                                                                                                                                                                                                                                                     |   |                         | 4      |   |   | 3 |   |   | 4 |   |   | 4 |   |   | 3 |   |
|         Amortization      of capitalized interest                                                                                                                                                                                                                                                      |   |                         | 4      |   |   | 4 |   |   | 8 |   |   | 8 |   |   | 8 |   |
|  Less:                                                                                                                                                                                                                                                                                                                                    |   |                         |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
|  Equity in earnings of      investments accounted      for under                    the equity    method                                                                                                                                                                 |   |                         | 19     |   |   | 27 |   |   | 15 |   |   | 9 |   |   | 14 |   |
|  Total earnings available for      fixed charges                                                                                                                                                                                                                                                                                          |   | $                            | 3,739  |   | $ | 3,722 |   | $ | 3,108 |   | $ | 1,903 |   | $ | 1,840 |   |
| Fixed    charges:                                                                                                                                                                                                                                                                                                                              |   |                         |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
|  Interest and fixed      charges                                                                                                                                                                                                                                                                                                          |   | $                            | 528    |   | $ | 499 |   | $ | 450 |   | $ | 419 |   | $ | 429 |   |
| Reasonable approximation of      portion of rent under long-term operating leases representative of an      interest factor                                                                                                                                                                                                                    |   |                         | 282    |   |   | 261 |   |   | 221 |   |   | 195 |   |   | 182 |   |
| Total fixed      charges                                                                                                                                                                                                                                                                                                                       |   | $                            | 810    |   | $ | 760 |   | $ | 671 |   | $ | 614 |   | $ | 611 |   |
| Ratio of earnings to fixed      charges                                                                                                                                                                                                                                                                                                        |   |                         | 4.62x  |   |   | 4.90x |   |   | 4.63x |   |   | 3.10x |   |   | 3.01x |   |
| a       Prior      year numbers have been adjusted for the retrospective adoption of      Financial Accounting Standards Board (FASB) Staff Position      (FSP)  AUG AIR-1, Accounting      for Planned Major Maintenance Activities. See Note 2 to the      Consolidated Financial Statements for additional      information. |   |