unsecured debt. For additional information regarding our Chapter 11 proceedings and long-term debt, see Notes 1 and 6, respectively, of the Notes to the Consolidated Financial Statements.

 

Cash provided by financing activities totaled $830 million and $636 million for the years ended December 31, 2005 and 2004, respectively. This change is primarily attributable to the net proceeds we received under our DIP Credit Facility as discussed above compared to the net proceeds we received in 2004 in connection with newly entered or amended financing arrangements in the aggregate amount of $1.8 billion and the issuance of 2 ⅞ % Convertible Senior Notes due 2024 in the amount of $325 million. As discussed above, after filing for bankruptcy, we ceased making payments on our unsecured debt.

 

Contractual Obligations

 

The following table summarizes our contractual obligations as of December 31, 2006 that relate to debt; operating leases; aircraft order commitments; capital leases; contract carrier obligations; other material, noncancelable purchase obligations; and other liabilities. We are in the process of evaluating our executory contracts in order to determine which contracts will be assumed in our Chapter 11 proceedings. Therefore, obligations as currently quantified in the table below and in the text immediately following the footnotes to the table will continue to change. The table below does not include contracts that we have successfully rejected through our Chapter 11 proceedings. The table also does not include commitments that are contingent on events or other factors that are uncertain or unknown at this time, some of which are discussed in footnotes to this table and in the text immediately following the footnotes.

 

 

 

Under our settlement agreement with the PBGC relating to the termination of the Pilot Plan, we are required to issue to the PBGC, no later than seven business days after our emergence from bankruptcy, senior unsecured notes (“PBGC Notes”) with an aggregate principal amount of $225 million, a term of up to 15 years and an annual interest rate calculated to ensure the PBGC Notes trade at par on the issuance date. We may replace all or a portion of the principal amount of the PBGC Notes with cash prior to their issuance, which we are required to do under certain circumstances.

 

We have signed a letter of intent with a third party to lease 10 B-757-200ER aircraft. These aircraft will be delivered from July 2007 through November 2007 and will be leased for seven years and three months each. We have also signed a letter of intent with a separate third party to lease three B-757-200ER aircraft which would be delivered to us in the first quarter of 2008, or such earlier dates as the parties may agree and will be leased for five years. These aircraft leases are not included in the table above.

 

On January 31, 2007, we entered into an agreement to acquire 30 CRJ-900 aircraft from Bombardier Inc., with options to acquire an additional 30 CRJ-900 aircraft. The aircraft will be delivered in two-class, 76 seat configuration between September 2007 and February 2010. We expect these aircraft will be operated by regional