Southwest Airlines Company (LUV)

Short-term investments

Short-term investments consist of investments with maturities of greater than three months but less than twelve months. These are primarily money market funds and investment grade commercial paper issued by major corporations and financial institutions, short-term securities issued by the U.S. Government, and certain auction rate securities with auction reset periods of less than 12 months for which auctions have been successful or are expected to be successful within the following 12 months. All of these investments are classified as available-for-sale securities and are stated at fair value, except for $17 million in auction rate securities that are classified as trading securities as discussed in Note 11. For all short-term investments, at each reset period, the Company accounts for the transaction as “Proceeds from sales of short-term investments” for the security relinquished, and a “Purchase of short-investments” for the security purchased, in the accompanying Consolidated Statement of Cash Flows. Unrealized gains and losses, net of tax, are recognized in “Accumulated other comprehensive income (loss)” in the accompanying Consolidated Balance Sheet. Realized net gains on specific investments, which totaled $13 million in 2008, $17 million in 2007, and $17 million in 2006, are reflected in “Interest income” in the accompanying Consolidated Statement of Income.

The Company’s cash and cash equivalents and short-term investments as of December 31, 2007 included $2.0 billion in collateral deposits received from a counterparty of the Company’s fuel derivative instruments. As of December 31, 2008, the Company did not hold any cash collateral deposits from counterparties, but had $240 million of its cash on deposit with a counterparty. Although amounts provided or held are not restricted in any way, investment earnings from these deposits generally must be remitted back to the entity that provided the deposit. Depending on the fair value of the Company’s fuel derivative instruments, the amounts of collateral deposits held or provided at any point in time can fluctuate significantly. Therefore, the Company generally excludes cash collateral deposits held, but includes deposits provided, in its decisions related to long-term cash planning and forecasting. See Note 10 for further information on these collateral deposits and fuel derivative instruments.

Short-term investments

Short-term investments consist of investments with maturities of greater than three months but less than twelve months. These are primarily money market funds and investment grade commercial paper issued by major corporations and financial institutions, short-term securities issued by the U.S. Government, and certain auction rate securities with auction reset periods of less than 12 months for which auctions have been successful or are expected to be successful within the following 12 months. All of these investments are classified as available-for-sale securities and are stated at fair value, except for $17 million in auction rate securities that are classified as trading securities as discussed in Note 11. For all short-term investments, at each reset period, the Company accounts for the transaction as “Proceeds from sales of short-term investments” for the security relinquished, and a “Purchase of short-investments” for the security purchased, in the accompanying Consolidated Statement of Cash Flows. Unrealized gains and losses, net of tax, are recognized in “Accumulated other comprehensive income (loss)” in the accompanying Consolidated Balance Sheet. Realized net gains on specific investments, which totaled $13 million in 2008, $17 million in 2007, and $17 million in 2006, are reflected in “Interest income” in the accompanying Consolidated Statement of Income.

The Company’s cash and cash equivalents and short-term investments as of December 31, 2007 included $2.0 billion in collateral deposits received from a counterparty of the Company’s fuel derivative instruments. As of December 31, 2008, the Company did not hold any cash collateral deposits from counterparties, but had $240 million of its cash on deposit with a counterparty. Although amounts provided or held are not restricted in any way, investment earnings from these deposits generally must be remitted back to the entity that provided the deposit. Depending on the fair value of the Company’s fuel derivative instruments, the amounts of collateral deposits held or provided at any point in time can fluctuate significantly. Therefore, the Company generally excludes cash collateral deposits held, but includes deposits provided, in its decisions related to long-term cash planning and forecasting. See Note 10 for further information on these collateral deposits and fuel derivative instruments.