million . In addition, the Board of Directors authorized a $500 million share repurchase program, to be completed no later than June 30, 2016 . During 2013 , we repurchased and retired approximately 10 million shares at a cost of approximately $250 million .  

 

In 2013, we received $268 million in financing proceeds from long-term debt, which is secured by aircraft delivered in 2013. In 2012, we received $480 million in financing proceeds from long-term debt secured by aircraft previously financed by debt. In 2012, we also refinanced $1.7 billion in debt and undrawn revolving credit facilities secured by our Pacific routes and slots, which resulted in a lower interest rate.  



Contractual Obligations  

 

The following table summarizes our contractual obligations at December 31, 2013 that we expect will be paid in cash. The table does not include amounts that are contingent on events or other factors that are uncertain or unknown at this time, including legal contingencies, uncertain tax positions and amounts payable under collective bargaining arrangements, among others. In addition, the table does not include expected significant cash payments which are generally ordinary course of business obligations that do not include contractual commitments.  

 

The amounts presented are based on various estimates, including estimates regarding the timing of payments, prevailing interest rates, volumes purchased, the occurrence of certain events and other factors. Accordingly, the actual results may vary materially from the amounts presented in the table.  

 

Long-Term Debt, Principal Amount. Represents scheduled principal payments on long-term debt.  

 

Long-Term Debt, Interest Payments. Represents estimated interest payments under our long-term debt based on the interest rates specified in the applicable debt agreements. Interest payments on variable interest rate debt were calculated using LIBOR at December 31, 2013 .  

 

Aircraft Purchase Commitments. Represents our commitments to purchase 88 B-737-900ER, 30 A321-200, 28 CRJ-900, 18 B-787-8 aircraft and 10 A330-300 aircraft. Our purchase commitment for 18 B-787-8 aircraft provides for certain aircraft substitution rights.  

 

Contract Carrier Obligations. Represents our estimated minimum fixed obligations under capacity purchase agreements with regional carriers. The reported amounts are based on (1) the required minimum levels of flying by our contract carriers under the applicable agreements and (2) assumptions regarding the costs associated with such minimum levels of flying.  

 

Employee Benefit Obligations. Represents primarily (1) our estimated minimum required funding for our qualified defined benefit pension plans based on actuarially determined estimates and (2) projected future benefit payments from our unfunded postretirement and 

postemployment plans. For additional information about our employee benefit obligations, see “Critical Accounting Policies and Estimates.”  

 

Other Obligations. Represents estimated purchase obligations under which we are required to make minimum payments for goods and services, including but not limited to insurance, marketing,