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Fair Value
3 Months Ended
Mar. 31, 2024
Fair Value Disclosures [Abstract]  
Fair Value Fair Value
Under Topic 820, Fair Value Measurement of the FASB Accounting Standards Codification, (the "Codification"), disclosures are required about how fair value is determined for assets and liabilities and a hierarchy for which these assets and liabilities must be grouped is established, based on significant levels of inputs as follows:
Level 1 - observable inputs such as unadjusted quoted prices in active markets for identical assets or liabilities;
Level 2 - quoted prices in active markets for similar assets and liabilities, and other inputs that are observable directly or indirectly for the asset or liability; or
Level 3 - unobservable inputs for the asset or liability, such as discounted cash flow models or valuations.
The determination of where assets and liabilities fall within this hierarchy is based upon the lowest level of input that is significant to the fair value measurement.
The following is a listing of our assets required to be measured at fair value on a recurring basis and where they are classified within the fair value hierarchy as of March 31, 2024 and December 31, 2023 (in millions):
March 31, 2024
Level 1Level 2Level 3Total
Assets
Cash equivalents$897 $— $— $897 
Available-for-sale investment securities— 240 16 256 
Aircraft fuel derivatives— — 
December 31, 2023
Level 1Level 2Level 3Total
Assets
Cash equivalents$724 $— $— $724 
Available-for-sale investment securities— 314 16 330 
Aircraft fuel derivatives— — 
Refer to Note 3 for fair value information related to our outstanding debt obligations as of March 31, 2024 and December 31, 2023.
Cash Equivalents
Our cash equivalents include money market securities and time deposits which are readily convertible into cash, have maturities of three months or less when purchased, and are considered to be highly liquid and easily tradable. The money market securities are valued using inputs observable in active markets for identical securities and are therefore classified as Level 1 within our fair value hierarchy and recorded within cash and cash equivalents on our consolidated balance sheets.
Available-for-Sale Investment Securities
Our available-for-sale investment securities include investments such as time deposits, commercial paper, and convertible debt securities. The fair value of time deposits and commercial paper is based on observable inputs in non-active markets, which are therefore classified as Level 2 in the hierarchy. The fair value of convertible debt securities is based on unobservable inputs and is classified as Level 3 in the hierarchy.
Aircraft Fuel Derivatives
Our aircraft fuel derivatives include call spread options which are not traded on public exchanges. Their fair values are determined using a market approach based on inputs that are readily available from public markets for commodities and energy trading activities; therefore, they are classified as Level 2 inputs. The data inputs are combined into qualitative models and processes to generate forward curves and volatility related to the specific terms of the underlying hedge contracts. Aircraft fuel derivatives are included in prepaid expenses and other within current assets of our consolidated balance sheets.
Held-to-Maturity Investment Securities
Our held-to-maturity investment securities consist of corporate bonds, which are stated at amortized cost. If the corporate bonds were measured at fair value, they would be classified as Level 2 in the fair value hierarchy, based on quoted prices in active markets for similar securities.
We do not intend to sell these investment securities. The carrying value and estimated fair value of our held-to-maturity investment securities were as follows (in millions):
March 31, 2024December 31, 2023
Carrying ValueFair ValueCarrying ValueFair Value
Held-to-maturity investment securities$215 $212 $234 $231