SUMMARY OF ACCOUNTING POLICIES	12 Months Ended
Dec. 31, 2025
EBP 002
EBP, Accounting Policy [Line Items]
SUMMARY OF ACCOUNTING POLICIES	SUMMARY OF ACCOUNTING POLICIES Basis of Accounting — The accompanying financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”). Use of Estimates — The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and changes therein and the disclosure of contingent assets and liabilities. Actual results could differ from those estimates. Risks and Uncertainties — The Plan utilizes various investment instruments. Investment securities, in general, are exposed to various risks, such as interest rate risk, credit risk, and overall market volatility. Market risks include global events, such as a pandemic or international conflict, which could impact the value of investment securities. Due to the level of risk associated with certain investment securities, it is reasonably possible that changes in the values of investment securities will occur in the near term and that such changes could materially affect the amounts reported in the financial statements. Valuation of Investments — Investments in the Master Trust are stated at fair value, except for fully benefit-responsive investment contracts (“FBRICs”) or synthetic GICs, which are reported at contract value. Fair value of a financial instrument is the price that would be received to sell an asset or paid to transfer a liability (exit price) in an orderly transaction between market participants at the measurement date. Securities traded in markets that are not considered active may be valued using unobservable inputs, such as less recent trade prices, single broker-dealer quotations, related yield curves, and other assumptions about the security. Contract value is the amount Members would receive if they were to initiate permitted transactions under the terms of the Plan (see Note 3). The Master Trust’s investments, as discussed in Note 4, are valued as follows: •Common stock, including Boeing common stock, preferred stock, and other investments (rights, warrants, exchange-traded funds, exchange-traded options, and other exchange-traded derivatives) traded in active markets on national and international exchanges are primarily valued using a market approach based on the closing market prices of identical instruments on the last trading day of the year. The other exchange-traded derivatives are included in other receivables and other liabilities on the Master Trust’s statements of net assets. •Forward and spot currency contracts are valued using a market value approach based on spot foreign currency rates if the contract tenor is two days or less and on interpolated forward rates for any contracts with a tenor greater than two days. Forward and spot currency contracts are included in other receivables and other liabilities on the Master Trust’s statements of net assets. •Investments in common/collective trust funds are valued based on the year-end unit net asset value (“NAV”). The NAV is used as a practical expedient to estimate fair value. Unit values are determined by the issuer or third party administrator by dividing the fair values of the total net assets at year-end by the outstanding units. There were no unfunded commitments, no restrictions on redemption frequency, and no advance notice periods required for redemption for these investments. •Synthetic GICs are stated at contract value. There are no reserves against contract value for credit risk of the contract issuer. The fixed-income securities underlying the contracts were valued based on the pricing methodology stated below for fixed-income securities. •Fixed-income securities, including government and agency securities, corporate bonds, and mortgage and asset-backed securities, are primarily valued using a market approach using matrix pricing, which considers a security’s relationship to other securities for which quoted prices in an active market may be available, or alternatively based on an income approach, which uses valuation techniques to convert future cash flows to a single present value amount. The valuation approach is designed to maximize the use of observable inputs, such as observable trade prices, multiple broker-dealer quotations, related yield curves, and other assumptions about the security (prepayment projections, cash flows, other security characteristics, etc.) and minimize unobservable inputs. The securities are valued as of the last trading day of the year. Fixed-income instruments that have a delayed future settlement such as to-be-announced securities (“TBAs”) are valued similarly to fixed-income securities in active markets. TBAs are included in the underlying assets associated with the synthetic GICs, other receivables, and other liabilities on the Master Trust’s statements of net assets. •Mutual funds, which are registered investment companies, are valued at the daily closing price as reported by the fund. Funds held by the Master Trust are open-ended funds that are registered with the Securities and Exchange Commission. These funds are required to publish their daily NAV and to transact at that price. •Short-term investments include certificates of deposits, commercial paper, treasury bills, and discounted notes with original maturities greater than three months, but less than one year. These investments are primarily valued using a market approach in the same manner as fixed-income securities referenced above. •Other investments include physical commodities and over-the-counter (“OTC”) derivatives, such as options and swap contracts. Physical commodities are valued on a market approach using the front month futures contract for the specific commodity. The derivatives are valued using a market approach and are based upon the expected amount that the Master Trust would receive or pay to exit the derivative at the reporting date. The valuation methodology relies on inputs, including, but not limited to, benchmark yields, swap curves, cash flow analysis, ratings updates, and interdealer broker rates. Credit risk of the derivative counterparties is offset by collateralizing the expected amount that the Master Trust would receive or pay to terminate the derivative. In accordance with the Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) 946, Financial Services - Investment Companies, the synthetic GICs are included at contract value in participant-directed investments in the statements of net assets available for benefits. Contract value is the amount Members would receive if they were to initiate permitted transactions under the terms of the Plan and the terms of the synthetic GICs. The statement of changes in net assets available for benefits is presented on a contract-value basis. Purchases and sales of securities are recorded on a trade-date basis. Interest income is recorded on the accrual basis. Dividends are recorded on the ex-dividend date. Net appreciation/depreciation of investments includes both realized and unrealized gains or losses and is calculated as the difference between the fair value of the investments as of the beginning of the plan year or the purchase date in the current year and either the sales price or the end-of-year fair value. Cash and Cash Equivalents — Cash and cash equivalents include cash and cash collateral. Cash collateral is related to the collateral posted on derivatives. Valuation Oversight — Plan management has implemented processes that are designed to ensure that fair value measurements used by the Master Trust are appropriate and reliable, that they are based on observable inputs wherever possible, and that the valuation approaches are consistently applied and the assumptions used are reasonable. The valuation framework has a set of processes that provides for oversight and validation of the fair value methodologies as well as valuations. The Board of Directors of the Company has delegated the fiduciary oversight of plan assets within the Master Trust structures to the Employee Benefit Investment Committee (“EBIC”). The EBIC has sub-delegated this responsibility to the Chief Investment Officer (“CIO”), who manages Trust Investments and chairs the Valuation Committee. Trust Investments is responsible for the oversight of the Plan assets including selection and monitoring of investment managers, asset strategies, and risk management. The Valuation Committee is responsible for the oversight of the valuation practices of the Master Trust and is composed of the Managing Directors of Trust Investments, including Risk Management and Trust Operations and each of the Investment teams, along with the Director of Actuarial Services and Enterprise Benefits Accounting. The Valuation Committee meets periodically with the purpose of fulfilling the following responsibilities and provides an annual review to the EBIC of its findings and actions: •Review and approve annually the Trust Investments valuation practices, and review valuation practices used by third parties •Review and approve the year-end valuations, including the methods used to develop and substantiate the unobservable inputs used in the fair value measurement •Review analysis and benchmarks used by the Company and the Master Trust to assess the reasonableness of the year-end valuations and changes in fair value measurements from period to period •Review and approve annual financial statement disclosures of the investments held in the Master Trust Common/collective trust funds are generally valued using the NAV or its equivalent. Valuations provided by the funds are reviewed at least quarterly. The asset managers’ audited financial statements are used in the Master Trust's annual financial reporting process, where applicable. Assessments of reasonableness include regular asset manager meetings and review of quarterly reports, third-party reviews and reconciliations, which includes escalation to Trust Investments for exceptions, quarterly CIO investment reviews, and reviews of manager valuation policies. Valuation policies are reviewed when a new mandate is entered into with an asset manager or as changes to policies are provided by managers. Fixed income, equity, and derivative instruments are generally valued using valuations obtained from pricing vendors. Pricing vendor valuation methodologies and custodian pricing controls and related documentation are assessed for reasonableness on an annual basis. The pricing vendor due diligence process includes reviews of pricing controls and procedures, as well as discussions in order to maintain a current understanding of the valuation processes and related assumptions and inputs that may be used by the vendors to price instruments. The custodian due diligence process includes reviews of pricing controls and procedures that are carried out on the Master Trust's behalf. This includes various levels of tolerances checks on price changes, review of stale or unchanged prices, multi-price source comparisons, and vendor price challenges. Additionally, on a monthly basis, the custodian reconciles its valuations to valuations obtained from each investment manager and any exceptions are reported to Trust Investments for resolution, which may include escalation to the Valuation Committee. Contributions — Contributions from Members and the matching contributions from the Company are recorded in the year in which the employee contributions are withheld from compensation. Benefits — Benefits are recorded when paid. Expenses — Necessary and proper expenses of the Plan are paid from the Plan assets at the Master Trust level, except for those expenses the Company is required by law or chooses to pay. Expenses are paid at the Master Trust level, deducted from income earned and therefore are recorded as a reduction of investment return and are not separately reflected in the Plan’s statement of changes in net assets available for benefits. Notes Receivable from Participants — Notes receivable from participants are measured at the unpaid principal balance, plus any accrued but unpaid interest. Delinquent Member loans are recorded as distributions based on the terms of the plan document.

Use of Estimates — The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and changes therein and the disclosure of contingent assets and liabilities. Actual results could differ from those estimates.

Risks and Uncertainties — The Plan utilizes various investment instruments. Investment securities, in general, are exposed to various risks, such as interest rate risk, credit risk, and overall market volatility. Market risks include global events, such as a pandemic or international conflict, which could impact the value of investment securities. Due to the level of risk associated with certain investment securities, it is reasonably possible that changes in the values of investment securities will occur in the near term and that such changes could materially affect the amounts reported in the financial statements.

Valuation of Investments — Investments in the Master Trust are stated at fair value, except for fully benefit-responsive investment contracts (“FBRICs”) or synthetic GICs, which are reported at contract value. Fair value of a financial instrument is the price that would be received to sell an asset or paid to transfer a liability (exit price) in an orderly transaction between market participants at the measurement date. Securities traded in markets that are not considered active may be valued using unobservable inputs, such as less recent trade prices, single broker-dealer quotations, related yield curves, and other assumptions about the security. Contract value is the amount Members would receive if they were to initiate permitted transactions under the terms of the Plan (see Note 3). The Master Trust’s investments, as discussed in Note 4, are valued as follows:

•Common stock, including Boeing common stock, preferred stock, and other investments (rights, warrants, exchange-traded funds, exchange-traded options, and other exchange-traded derivatives) traded in active markets on national and international exchanges are primarily valued using a market approach based on the closing market prices of identical instruments on the last trading day

•Forward and spot currency contracts are valued using a market value approach based on spot foreign currency rates if the contract tenor is two days or less and on interpolated forward rates for any contracts with a tenor greater than two days. Forward and spot currency contracts are included in other receivables and other liabilities on the Master Trust’s statements of net assets.

•Investments in common/collective trust funds are valued based on the year-end unit net asset value (“NAV”). The NAV is used as a practical expedient to estimate fair value. Unit values are determined by the issuer or third party administrator by dividing the fair values of the total net assets at year-end by the outstanding units. There were no unfunded commitments, no restrictions on redemption frequency, and no advance notice periods required for redemption for these investments.

•Synthetic GICs are stated at contract value. There are no reserves against contract value for credit risk of the contract issuer. The fixed-income securities underlying the contracts were valued based on the pricing methodology stated below for fixed-income securities.

•Fixed-income securities, including government and agency securities, corporate bonds, and mortgage and asset-backed securities, are primarily valued using a market approach using matrix pricing, which considers a security’s relationship to other securities for which quoted prices in an active market may be available, or alternatively based on an income approach, which uses valuation techniques to convert future cash flows to a single present value amount. The valuation approach is designed to maximize the use of observable inputs, such as observable trade prices, multiple broker-dealer quotations, related yield curves, and other assumptions about the security (prepayment projections, cash flows, other security characteristics, etc.) and minimize unobservable inputs. The securities are valued as of the last trading day of the year. Fixed-income instruments that have a delayed future settlement such as to-be-announced securities (“TBAs”) are valued similarly to fixed-income securities in active markets. TBAs are included in the underlying assets associated with the synthetic GICs, other receivables, and other liabilities on the Master Trust’s statements of net assets.

•Mutual funds, which are registered investment companies, are valued at the daily closing price as reported by the fund. Funds held by the Master Trust are open-ended funds that are registered with the Securities and Exchange Commission. These funds are required to publish their daily NAV and to transact at that price.

•Short-term investments include certificates of deposits, commercial paper, treasury bills, and discounted notes with original maturities greater than three months, but less than one year. These investments are primarily valued using a market approach in the same manner as fixed-income securities referenced above.

•Other investments include physical commodities and over-the-counter (“OTC”) derivatives, such as options and swap contracts. Physical commodities are valued on a market approach using the front month futures contract for the specific commodity. The derivatives are valued using a market approach and are based upon the expected amount that the Master Trust would receive or pay to exit the derivative at the reporting date. The valuation methodology relies on inputs, including, but not limited to, benchmark yields, swap curves, cash flow analysis, ratings updates, and interdealer broker rates. Credit risk of the derivative counterparties is offset by collateralizing the expected amount that the Master Trust would receive or pay to terminate the derivative.

In accordance with the Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) 946, Financial Services - Investment Companies, the synthetic GICs are included at contract value in participant-directed investments in the statements of net assets available for benefits. Contract value is the amount Members would receive if they were to initiate permitted transactions under the terms of the Plan and the terms of the synthetic GICs. The statement of changes in net assets available for benefits is presented on a contract-value basis.

Purchases and sales of securities are recorded on a trade-date basis. Interest income is recorded on the accrual basis. Dividends are recorded on the ex-dividend date. Net appreciation/depreciation of investments includes both realized and unrealized gains or losses and is calculated as the difference between the fair value of the investments as of the beginning of the plan year or the purchase date in the current year and either the sales price or the end-of-year fair value.

Valuation Oversight — Plan management has implemented processes that are designed to ensure that fair value measurements used by the Master Trust are appropriate and reliable, that they are based on observable inputs wherever possible, and that the valuation approaches are consistently applied and the assumptions used are reasonable. The valuation framework has a set of processes that provides for oversight and validation of the fair value methodologies as well as valuations.

The Board of Directors of the Company has delegated the fiduciary oversight of plan assets within the Master Trust structures to the Employee Benefit Investment Committee (“EBIC”). The EBIC has sub-delegated this responsibility to the Chief Investment Officer (“CIO”), who manages Trust Investments and chairs the Valuation Committee. Trust Investments is responsible for the oversight of the Plan assets including selection and monitoring of investment managers, asset strategies, and risk management. The Valuation Committee is responsible for the oversight of the valuation practices of the Master Trust and is composed of the Managing Directors of Trust Investments, including Risk Management and Trust Operations and each of the Investment teams, along with the Director of Actuarial Services and Enterprise Benefits Accounting. The Valuation Committee meets periodically with the purpose of fulfilling the following responsibilities and provides an annual review to the EBIC of its findings and actions:

Common/collective trust funds are generally valued using the NAV or its equivalent. Valuations provided by the funds are reviewed at least quarterly. The asset managers’ audited financial statements are used in the Master Trust's annual financial reporting process, where applicable. Assessments of reasonableness include regular asset manager meetings and review of quarterly reports, third-party reviews and reconciliations, which includes escalation to Trust Investments for exceptions, quarterly CIO investment reviews, and reviews of manager valuation policies. Valuation policies are reviewed when a new mandate is entered into with an asset manager or as changes to policies are provided by managers.

Fixed income, equity, and derivative instruments are generally valued using valuations obtained from pricing vendors. Pricing vendor valuation methodologies and custodian pricing controls and related documentation are assessed for reasonableness on an annual basis. The pricing vendor due diligence process includes reviews of pricing controls and procedures, as well as discussions in order to maintain a current understanding of the valuation processes and related assumptions and inputs that may be used by the vendors to price instruments. The custodian due diligence process includes reviews of pricing controls and procedures that are carried out on the Master Trust's behalf. This includes various levels of tolerances checks on price changes, review of stale or unchanged prices, multi-price source comparisons, and vendor price challenges. Additionally, on a monthly basis, the custodian reconciles its valuations to valuations obtained from each investment manager and any exceptions are reported to Trust Investments for resolution, which may include escalation to the Valuation Committee.

Expenses — Necessary and proper expenses of the Plan are paid from the Plan assets at the Master Trust level, except for those expenses the Company is required by law or chooses to pay. Expenses are paid at the Master Trust level, deducted from income earned and therefore are recorded as a reduction of investment return and are not separately reflected in the Plan’s statement of changes in net assets available for benefits.

Notes Receivable from Participants — Notes receivable from participants are measured at the unpaid principal balance, plus any accrued but unpaid interest. Delinquent Member loans are recorded as distributions based on the terms of the plan document.