benefit cost for the year ended December 31, 2013 was 9%.  

 

Funding. Our funding obligations for qualified defined benefit plans are governed by the Employee Retirement Income Security Act. The Pension Protection Act of 2006 allows commercial airlines to elect alternative funding rules (“Alternative Funding Rules”) for defined benefit plans that are frozen. Delta elected the Alternative Funding Rules under which the unfunded liability for a frozen defined benefit plan may be amortized over a fixed 17-year period and is calculated using an 8.85% discount rate.  

 

While the Pension Protection Act makes our funding obligations for these plans more predictable, factors outside our control continue to have an impact on the funding requirements. Estimates of future funding requirements are based on various assumptions and can vary materially from actual funding requirements. Assumptions include, among other things, the actual and projected market performance of assets; statutory requirements; and demographic data for participants. For additional information, see Note 11 of the Notes to the Consolidated Financial Statements.  

 

Recent Accounting Standards  

 

Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income  

 

Recently issued accounting guidance revises the reporting of items reclassified out of accumulated other comprehensive income and is effective for fiscal years beginning after December 15, 2012. We adopted this guidance in the March 2013 quarter and have presented amounts reclassified out of accumulated other comprehensive income in a note to the financial statements. For more information about accumulated other comprehensive income (loss), see Note 14.  

 

Presentation of Comprehensive Income  

 

In June 2011, the Financial Accounting Standards Board issued "Presentation of Comprehensive Income." The standard revises the presentation and prominence of the items reported in other comprehensive income and is effective retrospectively for fiscal years beginning after December 15, 2011. We adopted this standard in 2012 and have presented comprehensive income in our Consolidated Statements of Comprehensive Income (Loss).  

 



Supplemental Information  

 

We sometimes use information that is derived from the Consolidated Financial Statements, but that is not presented in accordance with GAAP. Certain of this information is considered to be “non-GAAP financial measures” under the U.S. Securities and Exchange Commission rules. The non-GAAP financial measures should be considered in addition to results prepared in accordance with GAAP, but should not be considered a substitute for or superior to GAAP results.  

 

The following table shows a reconciliation of CASM (a GAAP measure) to CASM-Ex (a non-GAAP financial measure). We exclude the following items from CASM to determine CASM-Ex for the reasons described:  

 

Aircraft fuel and related taxes. The volatility in fuel prices impacts the comparability of year-over-year financial performance. The exclusion of aircraft fuel and related taxes from this measure (including our regional carriers under capacity purchase arrangements) allows investors