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FAIR VALUE MEASUREMENTS
 6 Months Ended
Jun. 30, 2026
Fair Value Disclosures [Abstract]  
FAIR VALUE MEASUREMENTS FAIR VALUE MEASUREMENTS
In determining fair value, there is a three-level hierarchy based on the reliability of the inputs used.

Level 1 refers to fair values based on quoted prices for identical instruments in active markets.

Level 2 refers to fair values estimated using significant other observable inputs such as similar instruments in active markets or quoted prices for identical or similar instrument in markets that are not active. Fair values for Level 2 instruments are determined using standard valuation models that incorporate inputs such as quoted prices for similar assets, interest rates, benchmark curves, credit ratings, and other observable inputs or market data.

Level 3 refers to fair values estimated using significant unobservable inputs for which there is little or no market data and that are significant to the fair value of the assets. Fair values for Level 3 instruments are determined using future cash flows and discount rates, which include information obtained from third-party valuation sources and other market sources, including recent offers from potential buyers.

Fair value of financial instruments measured on a recurring basis

As of June 30, 2026, cost basis and fair value for marketable securities were $1.6 billion. Differences in cost basis and fair value of marketable securities are primarily a result of changes in interest rates and general market conditions. The Company
does not believe any unrealized losses are the result of credit quality based on its evaluation of industry and duration exposure, credit ratings of the securities, liquidity profiles, and other observable information as of June 30, 2026.

Fair values of financial instruments on the condensed consolidated balance sheets:
June 30, 2026
(in millions)Level 1Level 2Total
Marketable securities
U.S. government and agency securities$347 $— $347 
Asset-backed securities— 238 238 
Mortgage-backed securities— 192 192 
Corporate notes and bonds— 802 802 
Other10 9 19 
Total Marketable securities$357 $1,241 $1,598 

December 31, 2025
(in millions)Level 1Level 2Total
Marketable securities
U.S. government and agency securities$371 $— $371 
Asset-backed securities— 231 231 
Mortgage-backed securities— 211 211 
Corporate notes and bonds— 663 663 
Other8 12 20 
Total Marketable securities$379 $1,117 $1,496 
The fair value of interest rate swaps on the balance sheet was not material as of June 30, 2026 and December 31, 2025.

Activity and maturities for marketable securities

Maturities for marketable securities:
June 30, 2026 (in millions)
Cost BasisFair Value
Due in one year or less$498 $497 
Due after one year through five years945 940 
Due after five years through ten years152 150 
Due after ten years1 1 
No maturity date5 10 
Total$1,601 $1,598 

Fair value of other financial instruments

The Company uses the following methods and assumptions to determine the fair value of financial instruments that are not recognized at fair value as described below.

Debt: The estimated fair value of substantially all fixed-rate debt and certain variable-rate debt is classified as Level 2. The estimated fair value of $729 million of certain variable-rate and fixed-rate debt, including Payroll Support Program (PSP) notes payable and Japanese Yen denominated debt, is classified as Level 3.

Fixed-rate debt on the condensed consolidated balance sheets and the estimated fair value of long-term fixed-rate debt:
(in millions)June 30, 2026December 31, 2025
Fixed-rate debt$2,556 $2,761 
Estimated fair value$2,543 $2,756 
Assets and liabilities measured at fair value on a nonrecurring basis

Certain assets and liabilities are recognized or disclosed at fair value on a nonrecurring basis, including property, plant and equipment, operating and finance lease assets, goodwill, and intangible assets. These assets are subject to fair valuation when there is evidence of impairment. No material impairments were recorded during the three and six months ended June 30, 2026.
Equity method and other investments

Air Group, through its Alaska Star Ventures entity, has made investments in funds and companies related to aviation innovation and sustainability. We account for investments under the equity method if we are able to exercise significant influence over the investee. We record our share of our equity method investees’ financial results within the non-operating expense section of the consolidated statements of operations. Investments in which we do not have significant influence are recorded at fair value or at cost, adjusted for any changes in price or impairments, if the fair value is not readily determinable. As of June 30, 2026 and December 31, 2025, the combined carrying value of these investments included in Other noncurrent assets in the consolidated balance sheets was $81 million and $74 million.