BOEING CO

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the shareholders and the Board of Directors of The Boeing Company

Opinion on the Financial Statements

We have audited the accompanying consolidated statements of financial position of The Boeing Company and subsidiaries (the "Company") as of December 31, 2023 and 2022, the related consolidated statements of operations, comprehensive income, equity, and cash flows, for each of the three years in the period ended December 31, 2023, and the related notes (collectively referred to as the "financial statements"). In our opinion, the financial statements present fairly, in all material respects, the financial position of the Company as of December 31, 2023 and 2022, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2023, in conformity with accounting principles generally accepted in the United States of America.

We have also audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the Company's internal control over financial reporting as of December 31, 2023, based on criteria established in Internal Control — Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission and our report dated January 31, 2024, expressed an unqualified opinion on the Company's internal control over financial reporting.

Basis for Opinion

These financial statements are the responsibility of the Company's management. Our responsibility is to express an opinion on the Company's financial statements based on our audits. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud. Our audits included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements. We believe that our audits provide a reasonable basis for our opinion.

Critical Audit Matters

The critical audit matters communicated below are matters arising from the current-period audit of the financial statements that were communicated or required to be communicated to the audit committee and that (1) relate to accounts or disclosures that are material to the financial statements and (2) involved our especially challenging, subjective, or complex judgments. The communication of critical audit matters does not alter in any way our opinion on the financial statements, taken as a whole, and we are not, by communicating the critical audit matters below, providing separate opinions on the critical audit matters or on the accounts or disclosures to which they relate.

Cost Estimates for Fixed-Price Development Contracts - Refer to Notes 1 and 13 to the financial statements

Critical Audit Matter Description

As more fully described in Notes 1 and 13 to the consolidated financial statements, the Company recognizes revenue over time for long-term contracts as goods are produced or services are rendered. The Company uses costs incurred as the method for determining progress, and revenue is recognized based on costs incurred to date plus an estimate of margin at completion. The process of estimating margin at completion involves estimating the costs to complete production of goods or rendering of services and comparing those costs to the estimated final revenue amount. Margins on fixed-price development contracts are inherently uncertain in that revenue is fixed while the estimates of costs required to complete these contracts are subject to significant variability. The operational and technical complexities of fixed-price development contracts create financial risk, which could increase the estimates of costs and result in lower margins or material reach-forward losses. The ongoing effects of supply chain and labor disruption compound these complexities and related financial risks.

Given the operational and technical complexities of certain of the Company’s fixed-price development contracts, including the KC-46A Tanker, Commercial Crew, VC-25B Presidential Aircraft, T-7A Redhawk, and MQ-25 contracts and the limited amount of historical data available in certain instances and significant judgments necessary to estimate future costs at completion, auditing these estimates involved extensive audit effort, a high degree of auditor judgment, and required audit professionals with specialized industry experience.

How the Critical Audit Matter Was Addressed in the Audit

Our audit procedures related to the cost estimates for the KC-46A Tanker, Commercial Crew, VC-25B Presidential Aircraft, T-7A Redhawk, and MQ-25 fixed-price development contracts included the following, among others:

•We evaluated the appropriateness and consistency of management’s methods used in developing its estimates.

•We evaluated the reasonableness of judgments made and significant assumptions used by management relating to key cost and schedule estimates, including the effects of supply chain and labor disruptions. We also evaluated the range and probabilities of reasonably possible outcomes, and where management set its point estimate within the range.

•We evaluated the appropriateness of the timing of the incorporation of changes to key estimates, including evaluating the timeline of key events and knowledge points that led to management’s determination that a change in estimate was necessary.

•We inquired of project management, engineers, supply chain leadership, and others directly involved with the execution of contracts to evaluate management’s ability to achieve the key cost and schedule estimates, as well as evaluate project status and challenges which may affect total estimated costs to complete.

•We observed the project work site when key estimates related to tangible or physical progress of the project.

•We tested the accuracy and completeness of the key data used in developing estimates. We developed independent expectations of reasonable outcomes using, in part, the program’s data and compared our expectations to management’s estimates.

•We performed retrospective reviews when evaluating the thoroughness and precision of management’s estimation process and effectiveness of the related internal controls by comparing actual outcomes to previous estimates and the related financial statement impact, and evaluating key judgements made by management when determining the timing of changes to key estimates.

•We tested the effectiveness of internal controls including, those over the review of significant judgments made and assumptions used to develop key estimates, key data used in developing the estimates and the mathematical extrapolation of such data.

Program Accounting Estimates for the 777X Program — Refer to Notes 1 and 7 to the financial statements

Critical Audit Matter Description

The introduction of new aircraft programs involves increased risk associated with meeting development, certification, and production schedules. The Company uses program accounting to compute cost of sales and margin for each commercial airplane sold. The use of program accounting requires estimating the costs over the expected life of each program. In particular, the level of effort to meet regulatory requirements and achieve certification may be challenging to predict, including potential delays in the timing of achieving certification that would delay entry into service and corresponding increases in estimated costs. Changes to the cost estimates related to regulatory requirements to achieve certification could occur, resulting in lower margins or material reach-forward losses. Auditing these estimated costs for the 777X program involved extensive audit effort, a high degree of auditor judgment, and required audit professionals with specialized industry experience.

How the Critical Audit Matter Was Addressed in the Audit

Our audit procedures related to the estimated costs for the 777X program included the following, among others:

•We evaluated the appropriateness and consistency of management’s methods used in developing its cost estimates related to regulatory requirements to achieve certification.

•We performed procedures to evaluate new changes in estimated costs driven by changes in regulatory requirements to achieve certification.

•We evaluated the timeline of key events and knowledge points that informs management’s determination to change the cost estimate related to regulatory requirements to achieve certification.

•We inquired of those directly involved with the certification of the aircraft to evaluate project status and challenges which may affect total estimated costs to certify the aircraft.

•We obtained and evaluated communications with regulatory bodies for consistency between management’s certification timeline assumptions and cost estimates related to regulatory requirements.

•We tested the effectiveness of internal controls, including those over the data used in developing the cost estimates, the mathematical extrapolation of such data, and management’s judgment regarding the range of possible outcomes relating to the specific cost estimates in the current regulatory environment.

/s/Deloitte & Touche LLP

Chicago, Illinois

January 31, 2024

We have served as the Company's auditor since at least 1934; however, an earlier year could not be reliably determined.

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the shareholders and the Board of Directors of The Boeing Company

Opinion on Internal Control over Financial Reporting

We have audited the internal control over financial reporting of The Boeing Company and subsidiaries (the “Company”) as of December 31, 2023, based on criteria established in Internal Control— Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). In our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2023, based on criteria established in Internal Control— Integrated Framework (2013) issued by COSO.

We have also audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the consolidated financial statements as of and for the year ended December 31, 2023 of the Company, and our report dated January 31, 2024 expressed an unqualified opinion on those financial statements.

Basis for Opinion

The Company’s management is responsible for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting, included in the accompanying Management’s Report on Internal Control Over Financial Reporting. Our responsibility is to express an opinion on the Company’s internal control over financial reporting based on our audit. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audit in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects. Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, testing and evaluating the design and operating effectiveness of internal control based on the assessed risk, and performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.

Definition and Limitations of Internal Control over Financial Reporting

A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

/s/Deloitte & Touche LLP

Chicago, Illinois

January 31, 2024