# EDGAR Filing Document

**Accession Number:** 0001364885
**File Stem:** 0001104659-25-119096
**Filing Date:** 2025-12
**Character Count:** 100873
**Document Hash:** 23c9427b7362cad262754041e02c6401
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001104659-25-119096.hdr.sgml**: 20251208

**ACCESSION NUMBER**: 0001104659-25-119096

**CONFORMED SUBMISSION TYPE**: 8-K

**PUBLIC DOCUMENT COUNT**: 19

**CONFORMED PERIOD OF REPORT**: 20251208

**ITEM INFORMATION**: Entry into a Material Definitive Agreement

**ITEM INFORMATION**: Termination of a Material Definitive Agreement

**ITEM INFORMATION**: Completion of Acquisition or Disposition of Assets

**ITEM INFORMATION**: Notice of Delisting or Failure to Satisfy a Continued Listing Rule or Standard; Transfer of Listing

**ITEM INFORMATION**: Material Modifications to Rights of Security Holders

**ITEM INFORMATION**: Changes in Control of Registrant

**ITEM INFORMATION**: Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers

**ITEM INFORMATION**: Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year

**ITEM INFORMATION**: Regulation FD Disclosure

**ITEM INFORMATION**: Financial Statements and Exhibits

**FILED AS OF DATE**: 20251208

**DATE AS OF CHANGE**: 20251208

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Spirit AeroSystems Holdings, Inc.
- **CENTRAL INDEX KEY:** 0001364885
- **STANDARD INDUSTRIAL CLASSIFICATION:** AIRCRAFT PART & AUXILIARY EQUIPMENT, NEC [3728]
- **ORGANIZATION NAME:** 04 Manufacturing
- **EIN:** 202436320
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 8-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-33160
- **FILM NUMBER:** 251554748

**BUSINESS ADDRESS:**
- **STREET 1:** 3801 SOUTH OLIVER
- **CITY:** WICHITA
- **STATE:** KS
- **ZIP:** 67210
- **BUSINESS PHONE:** 316.526.9000

**MAIL ADDRESS:**
- **STREET 1:** 3801 SOUTH OLIVER
- **CITY:** WICHITA
- **STATE:** KS
- **ZIP:** 67210

?xml version='1.0' encoding='ASCII'?

**UNITED STATES**

**SECURITIES AND EXCHANGE COMMISSION**

**Washington, DC 20549**

**FORM 8-K**

**CURRENT REPORT**

**Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934**

Date of Report (Date of earliest event reported): **December 8, 2025**

**Spirit AeroSystems Holdings, Inc.**

(Exact name of registrant as specified in its charter)

---

| | | |
|:---|:---|:---|
| **Delaware** | **001-33160** | **20-2436320** |
| (State or other jurisdiction<br> of incorporation) | (Commission <br> File Number) | (IRS Employer <br> Identification No.) |

---

<u>**3801 South Oliver** **, Wichita, KS 67210**</u>

(Address of principal executive offices) (Zip Code)

(Registrant's telephone number, including area code): **(316) 526-9000**

**N/A**

(Former name or former address, if changed since last report.)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

◻ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

◻ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

◻ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

◻ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

---

| | | |
|:---|:---|:---|
| **Title of each class:** | **Trading symbol(s)** | **Name of exchange on which registered** |
| Class A Common Stock, par value $0.01 per share | SPR | New York Stock Exchange |

---

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ◻

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ◻

**Introductory Note**

On June 30, 2024, Spirit AeroSystems Holdings, Inc., a Delaware corporation ("<u>Spirit</u>"), entered into an Agreement and Plan of Merger (the "<u>Merger Agreement</u>") with The Boeing Company, a Delaware corporation ("<u>Boeing</u>"), and Sphere Acquisition Corp., a Delaware corporation and wholly owned subsidiary of Boeing ("<u>Merger Sub</u>"), providing for the merger of Merger Sub with and into Spirit (the "<u>Merger</u>") and for Spirit to be the surviving corporation in the Merger.

On April 27, 2025, Spirit AeroSystems, Inc., a Delaware corporation ("<u>Seller</u>") and wholly owned subsidiary of Spirit, and Airbus SE, a European public company incorporated under Dutch law ("<u>Airbus SE</u>"), entered into a Stock and Asset Purchase Agreement (as amended, supplemented or modified from time to time in accordance with its terms, the "<u>SAPA</u>") providing for, among other things, the acquisition by Airbus SE of certain of Spirit's businesses related to the performance by Spirit and its subsidiaries of their obligations under their supply contracts with Airbus SE and its affiliates (collectively, the "<u>Spirit Airbus Business</u>," and the transactions contemplated by the SAPA, the "<u>Airbus Transaction</u>").

On August 8, 2025, Seller and Seller's wholly owned subsidiary Spirit AeroSystems International Holdings, Inc., a Delaware corporation ("<u>Spirit International</u>"), entered into a Share Purchase Agreement (as amended, supplemented or modified from time to time in accordance with its terms, the "<u>Share Purchase Agreement</u>") with Composites Technology Research Malaysia Sdn. Bhd., a Malaysian private limited company ("<u>CTRM</u>"), and, solely for the purposes set forth therein, DRB-HICOM Berhad, a Malaysian public limited company ("<u>DRB-HICOM</u>"), providing for, among other things, CTRM to acquire from Seller and Spirit International all of the outstanding equity interests in Spirit AeroSystems Malaysia Sdn. Bhd., a Malaysian private limited company (the "<u>CTRM Transaction</u>").

The Merger, the Airbus Transaction and the CTRM Transaction were completed on December 8, 2025.

The descriptions of the Merger Agreement, the SAPA and the Share Purchase Agreement in this Current Report on Form 8-K are qualified in their entirety by reference to the text of the Merger Agreement, the SAPA and the Share Purchase Agreement, filed as Exhibit 2.1, Exhibit 2.2 and Exhibit 2.3, respectively, to this Current Report on Form 8-K and incorporated by reference herein.

Each of the Merger Agreement, the SAPA and the Share Purchase Agreement contains representations and warranties by the parties thereto, which were made only for purposes of that agreement and as of specified dates. The representations, warranties, covenants, and agreements in the Merger Agreement, the SAPA and the Share Purchase Agreement were made solely for the benefit of the parties to those agreements, are subject to qualifications and limitations agreed upon by the contracting parties, including being qualified by confidential disclosures made for the purpose of allocating risk between the parties to those agreements rather than establishing those matters as facts, and are subject to standards of materiality applicable to the parties to those agreements that may differ from those applicable to investors. Investors should not rely on the representations, warranties, covenants, and agreements or any descriptions thereof as characterizations of the actual state of facts or condition of Spirit, Boeing, Airbus SE, DRB-HICOM or any of their respective subsidiaries or affiliates. Moreover, information concerning the subject matter of the representations, warranties, covenants, and agreements may have changed after the respective dates of the Merger Agreement, the SAPA and the Share Purchase Agreement, which subsequent information may or may not be fully reflected in Spirit's, Boeing's, Airbus SE's or DRB-HICOM's respective public disclosures.

---

| | |
|:---|:---|
| **Item 1.01** | **Entry into a Material Definitive Agreement.** |

---

On December 8, 2025, Seller entered into: an Eighth Supplemental Indenture (the "<u>2026 Notes Eighth Supplemental Indenture</u>") to the Indenture, dated as of June 1, 2016, among Seller, Boeing, and The Bank of New York Mellon Trust Company, N.A., as trustee (the "<u>Trustee</u>"), in connection with Seller's 3.850% Senior Notes due 2026 (the "<u>2026 Notes</u>"); a First Supplemental Indenture (the "<u>2028 Exchangeable Notes First Supplemental Indenture</u>") to the Indenture, dated as of November 13, 2023, among Seller, Spirit, Boeing and the Trustee, in connection with Seller's 3.250% Exchangeable Senior Notes due 2028 (the "<u>2028 Exchangeable Notes</u>"); and a First Supplemental Indenture (the "<u>2028 Notes First Supplemental Indenture</u>") to the Indenture, dated as of May 30, 2018, among Seller, Boeing and the Trustee, in connection with Seller's 4.600% Senior Notes due 2028 (the "<u>2028 Notes</u>").

The 2026 Notes Eighth Supplemental Indenture and the 2028 Exchangeable Notes First Supplemental Indenture evidence the release of Spirit AeroSystems North Carolina, Inc., a North Carolina corporation ("<u>Spirit NC</u>") as a guarantor of the 2026 Notes and the 2028 Exchangeable Notes, respectively, and the release of liens on collateral owned by Spirit that had secured the 2026 Notes. In addition, the 2026 Notes Eighth Supplemental Indenture and the 2028 Notes First Supplemental Indenture provide that Boeing will unconditionally guarantee the Seller's obligations under the 2026 Notes and 2028 Notes, respectively.

The descriptions of the 2026 Notes Eighth Supplemental Indenture, the 2028 Notes First Supplemental Indenture and the 2028 Exchangeable Notes First Supplemental Indenture in this Current Report on Form 8-K are qualified in their entirety by reference to the text of the 2026 Notes Eighth Supplemental Indenture, the 2028 Notes First Supplemental Indenture and the 2028 Exchangeable Notes First Supplemental Indenture filed as Exhibits 4.1, 4.2 and 4.3, respectively to this Current Report on Form 8-K and incorporated herein by reference.

---

| | |
|:---|:---|
| **Item 1.02** | **Termination of a Material Definitive Agreement.** |

---

The information in the Introductory Note of this Current Report on Form 8-K is incorporated by reference into this Item 1.02.

Concurrently with the closing of the Merger on December 8, 2025, Spirit terminated and repaid in full all outstanding indebtedness and other obligations due under each of (a) the Amended and Restated Delayed-Draw Bridge Credit Agreement, dated as of June 25, 2025 (as amended and as otherwise modified and in effect immediately prior to the Payoff (as defined below), the "<u>Bridge Credit Agreement</u>"), by and among Spirit, the lenders party thereto and Morgan Stanley Senior Funding, Inc., as administrative agent and as collateral agent and (b) the Term Loan Credit Agreement, dated as of October 5, 2020 (as amended and modified by that certain First Refinancing, Incremental Assumption and Amendment Agreement, dated as of November 1, 2021, as further amended and modified by that certain Second Refinancing Amendment to Term Loan Credit Agreement, dated as of November 23, 2022, and as further amended and modified by that certain Third Amendment to Term Loan Credit Agreement, dated as of February 14, 2025, and as otherwise modified and in effect immediately prior to the Payoff, the "<u>Term Loan Credit Agreement</u>"), by and among Spirit, the lenders party thereto, and Bank of America, N.A., as administrative agent and as collateral agent (collectively, the "<u>Payoff</u>"). In connection with the Payoff, all related security interests and guarantees were automatically and irrevocably terminated and released.

In connection with the closing of the Merger, on December 8, 2025, all of the Seller's outstanding 9.375% Senior Secured First Lien Notes due 2029 (the "<u>2029 Notes</u>") and 9.750% Senior Secured Second Lien Notes due 2030 (the "<u>2030 Notes</u>" and together with the 2029 Notes, the "<u>Redeemed Notes</u>") will be redeemed at the redemption prices provided for in the applicable indenture, plus in each case, accrued and unpaid interest up to (but excluding) the redemption date (the "<u>Redemption</u>"). The 2029 Notes were issued pursuant to the Indenture, dated as of November 23, 2022, among Seller, Spirit, Spirit NC and the Trustee, (the "<u>2029 Notes Indenture</u>") and the 2030 Notes were issued pursuant to the Indenture, dated as of November 21, 2023, among Seller, Spirit, Spirit NC and the Trustee (the "<u>2030 Notes Indenture</u>", and together with the 2029 Notes Indenture, the "<u>Redeemed Notes Indentures</u>"). As a result of the Redemption, each of the Redeemed Notes Indentures were satisfied and discharged.

This Current Report on Form 8-K does not constitute a notice of redemption under the optional redemption provisions of the Redeemed Notes Indentures, nor does it constitute an offer to sell, or a solicitation of an offer to buy, any security. No offer, solicitation, or sale will be made in any jurisdiction in which such an offer, solicitation, or sale would be unlawful.

---

| | |
|:---|:---|
| **Item 2.01** | **Completion of Acquisition or Disposition of Assets.** |

---

The information in the Introductory Note and Items 3.03, 5.01 and 5.03 of this Current Report on Form 8-K is incorporated by reference into this Item 2.01.

In accordance with the terms of the Merger Agreement, on December 8, 2025, at the effective time of the Merger (the "<u>Effective Time</u>"), Merger Sub merged with and into Spirit, with Spirit continuing as the surviving corporation in the Merger as a direct wholly owned subsidiary of Boeing.

At the Effective Time, each share of Class A common stock, par value $0.01 per share, of Spirit ("<u>Spirit Common Stock</u>") issued and outstanding immediately prior to the Effective Time (other than shares of Spirit Common Stock owned by Boeing, Merger Sub, any other wholly owned subsidiary of Boeing, Spirit, or any wholly owned subsidiary of Spirit, in each case, not held on behalf of third parties) was automatically canceled and ceased to exist, and was converted into the right to receive 0.1955 shares of Common Stock, of the par value of $5.00 each, of Boeing ("<u>Boeing Common Stock</u>") (such number of shares of Boeing Common Stock, the "<u>Per Share Merger Consideration</u>").

In addition, at the Effective Time:

&nbsp;&nbsp;&nbsp;&nbsp;· Each Spirit restricted stock unit (" <u>Spirit RSU</u> ") that was outstanding (and was not a Specified Award (as defined below)) was automatically converted into a restricted
stock unit denominated in shares of Boeing Common Stock (a " <u>Boeing Stock-Based RSU</u> "), the number of such shares being
equal to the product (rounded to the nearest whole number) of the total number of shares of Spirit Common Stock subject to such Sprit
RSU immediately prior to the Effective Time multiplied by the Per Share Merger Consideration, and any accrued but unpaid dividend equivalents
with respect to such Spirit RSU were assumed and became an obligation with respect to the applicable Boeing Stock-Based RSU.

&nbsp;&nbsp;&nbsp;&nbsp;· Each Spirit performance stock unit (" <u>Spirit PSU</u> ") that was outstanding (and was not a Specified Award) was automatically converted into a Boeing Stock-Based RSU with respect
to a number of shares of Boeing Common Stock equal to the product (rounded to the nearest whole number) of the total number of shares
of Spirit Common Stock subject to such Spirit PSU immediately prior to the Effective Time based on the attainment of the applicable performance
metrics at the actual level of performance, determined as specified in the Merger Agreement, multiplied by the Per Share Merger Consideration.

&nbsp;&nbsp;&nbsp;&nbsp;· Each outstanding Spirit RSU, Spirit PSU or
 restricted share of Spirit Common Stock granted under Spirit's omnibus incentive plans that (a) was vested but not yet
 settled as of immediately prior to the Effective Time, (b) was outstanding, as of immediately prior to the Effective Time, and
 was granted to a non-employee member of the Board, (c) vested effective as of the Effective Time in accordance with its terms
 or (d) was outstanding immediately prior to the Effective Time and held by a person who, as of immediately prior to the
 Effective Time, was no longer an employee or other service provider to Spirit (each, a " <u>Specified Award</u> ") was automatically canceled, and the holder thereof was entitled to receive (subject to any applicable
 withholding or other taxes or other amounts required to be withheld by applicable law) the Per Share Merger Consideration multiplied
 by the number of shares of Spirit Common Stock subject to such Specified Award immediately prior to the Effective Time, provided
 that the number of shares of Spirit Common Stock subject to those Specified Awards that were Spirit PSUs was determined based on the
 attainment of the applicable performance metrics at the actual level of performance, determined as specified in the Merger
 Agreement.

In accordance with the terms of the SAPA, on December 8, 2025, Airbus SE and its affiliates acquired the Spirit Airbus Business, except for certain assets primarily related to the Airbus SE work packages operated in Spirit's facilities in Subang, Malaysia, which were, in accordance with the terms of the Share Purchase Agreement, acquired by CTRM, and cash in the amount of $621,157,968.71, for nominal consideration of $1.00, subject to working capital and other purchase price adjustments.

---

| | |
|:---|:---|
| **Item 3.01** | **Notice of Delisting or Failure to Satisfy a Continued Listing Rule or Standard; Transfer of Listing.** |

---

The information in the Introductory Note and Item 2.01 of this Current Report on Form 8-K is incorporated by reference into this Item 3.01.

In connection with the Merger, on December 8, 2025, Spirit notified the New York Stock Exchange ("<u>NYSE</u>") that the Merger was consummated and requested that NYSE halt trading of Spirit Common Stock prior to the opening of trading on December 8, 2025.

In addition, on December 8, 2025, Spirit requested that NYSE file with the United States Securities and Exchange Commission (the "<u>SEC</u>") a notification of removal from listing and/or registration under Section 12(b) of the Securities Exchange Act of 1934, as amended (the "<u>Exchange Act</u>"), on Form 25 to strike Spirit Common Stock from listing on NYSE and terminate its registration under Section 12(b) of the Exchange Act. NYSE is expected to file the Form 25 on December 8, 2025. As a result of the Form 25 filing, Spirit Common Stock will no longer be listed on NYSE.

Spirit intends to file a certification on Form 15 with the SEC regarding the termination of registration of all shares of Spirit Common Stock under Section 12(g) of the Exchange Act and the suspension of Spirit's reporting obligations under Sections 13 and 15(d) of the Exchange Act.

---

| | |
|:---|:---|
| **Item 3.03** | **Material Modification to Rights of Security Holders.** |

---

The information in the Introductory Note and Items 2.01, 3.01 and 5.03 of this Current Report on Form 8-K is incorporated by reference into this Item 3.03.

At the Effective Time, each holder of shares of Spirit Common Stock issued and outstanding immediately prior to the Effective Time ceased to have any rights as a stockholder of Spirit other than the right to receive the Per Share Merger Consideration pursuant to the Merger Agreement.

---

| | |
|:---|:---|
| **Item 5.01** | **Changes in Control of Registrant.** |

---

The information in the Introductory Note and Items 2.01, 3.03 and 5.02 of this Current Report on Form 8-K is incorporated by reference into this Item 5.01.

As a result of the Merger, on December 8, 2025, a change in control of Spirit occurred, and Spirit became a direct wholly owned subsidiary of Boeing.

---

| | |
|:---|:---|
| **Item 5.02** | **Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.** |

---

The information in the Introductory Note and Item 2.01 of this Current Report on Form 8-K is incorporated by reference into this Item 5.02.

In accordance with the Merger Agreement, at the Effective Time, all of the members of the board of directors of Spirit immediately prior to the Effective Time ceased to be directors of Spirit.

---

| | |
|:---|:---|
| **Item 5.03** | **Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year.** |

---

The information in the Introductory Note and Item 2.01 of this Current Report on Form 8-K is incorporated by reference into this Item 5.03.

At the Effective Time, the certificate of incorporation and bylaws of Spirit were amended and restated in their entirety as set forth in Exhibits 3.1 and 3.2, respectively, to this Current Report on Form 8-K, which exhibits are incorporated by reference into this Item 5.03.

---

| | |
|:---|:---|
| **Item 7.01** | **Regulation FD Disclosure.** |

---

On December 8, 2025, Boeing issued a press release announcing the completion of the Merger. A copy of the press release is attached hereto as Exhibit 99.1.

Exhibit 99.1 is incorporated into this Item 7.01 by reference. The information furnished in this Item 7.01 and Exhibit 99.1 shall not be deemed "filed" for purposes of Section 18 of the Exchange Act, or otherwise subject to the liabilities under that section, and shall not be deemed to be incorporated by reference into any other filing under Exchange Act or any filing under the Securities Act of 1933, as amended, except as expressly set forth by specific reference in such filing.

**Item 9.01 Financial Statements and Exhibits.**

(d) Exhibits

---

| | |
|:---|:---|
| **Exhibit<br> Number** | **Description** |
| [2.1](https://www.sec.gov/Archives/edgar/data/1364885/000110465924076479/tm2418602d1_ex2-1.htm) | [Agreement and Plan of Merger, dated as of June 30, 2024, among Spirit AeroSystems Holdings, Inc., The Boeing Company and Sphere Acquisition Corp. (incorporated by reference to Exhibit 2.1 to Spirit AeroSystems Holdings, Inc.'s Current Report on Form 8-K filed with the U.S. Securities and Exchange Commission on July 1, 2024).](https://www.sec.gov/Archives/edgar/data/1364885/000110465924076479/tm2418602d1_ex2-1.htm) |
| [2.2](https://www.sec.gov/Archives/edgar/data/1364885/000110465925039638/tm2513224d1_ex2-1.htm) | [Stock and Asset Purchase Agreement, dated as of April 27, 2025, between Spirit AeroSystems, Inc. and Airbus SE (incorporated by reference to Exhibit 2.1 to Spirit AeroSystems Holdings, Inc.'s Current Report on Form 8-K filed with the U.S. Securities and Exchange Commission on April 28, 2025).\*](https://www.sec.gov/Archives/edgar/data/1364885/000110465925039638/tm2513224d1_ex2-1.htm) |
| [2.3](https://www.sec.gov/Archives/edgar/data/1364885/000110465925075743/tm2522552d1_ex2-1.htm) | [Share Purchase Agreement, dated as of August 8, 2025, by and among Composites Technology Research Malaysia Sdn. Bhd., Spirit AeroSystems, Inc., Spirit AeroSystems International Holdings, Inc. and, solely for the purposes set forth therein, DRB-HICOM Berhad (incorporated by reference to Exhibit 2.1 to Spirit AeroSystems Holdings, Inc.'s Current Report on Form 8-K filed with the U.S. Securities and Exchange Commission on August 8, 2025).](https://www.sec.gov/Archives/edgar/data/1364885/000110465925075743/tm2522552d1_ex2-1.htm) |
| [3.1](tm2532915d1_ex3-1.htm) | [Amended and Restated Certificate of Incorporation of Spirit AeroSystems Holdings, Inc.](tm2532915d1_ex3-1.htm) |
| [3.2](tm2532915d1_ex3-2.htm) | [Amended and Restated Bylaws of Spirit AeroSystems Holdings, Inc.](tm2532915d1_ex3-2.htm) |
| [4.1](tm2532915d1_ex4-1.htm) | [Eighth Supplemental Indenture relating to the 3.850% Senior Notes due 2026, dated as of December 8, 2025, among Spirit AeroSystems, Inc., The Boeing Company and The Bank of New York Mellon Trust Company, N.A., as trustee.](tm2532915d1_ex4-1.htm) |
| [4.2](tm2532915d1_ex4-2.htm) | [First Supplemental Indenture relating to the 4.600% Senior Notes due 2028, dated as of December 8, 2025, among Spirit AeroSystems, Inc., The Boeing Company and The Bank of New York Mellon Trust Company, N.A., as trustee.](tm2532915d1_ex4-2.htm) |
| [4.3](tm2532915d1_ex4-3.htm) | [First Supplemental Indenture relating to the 3.250% Exchangeable Senior Notes due 2028, dated as of December 8, 2025, among Spirit AeroSystems, Inc., Spirit AeroSystems Holdings, Inc., The Boeing Company and The Bank of New York Mellon Trust Company, N.A., as trustee.](tm2532915d1_ex4-3.htm) |
| [99.1](tm2532915d1_ex99-1.htm) | [Press release, dated December 8, 2025](tm2532915d1_ex99-1.htm) |
| 104 | Cover Page Interactive Data File (the cover page XBRL tags are embedded within the Inline XBRL document). |

---

\* Confidential portions of the exhibit have been omitted in accordance with the rules of the U.S. Securities and Exchange Commission.

**SIGNATURES**

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

---

| | | |
|:---|:---|:---|
|  | **SPIRIT AEROSYSTEMS HOLDINGS, INC.** | **SPIRIT AEROSYSTEMS HOLDINGS, INC.** |
| Date: December 8, 2025 | By: | /s/ Sean Black |
|  |  | Sean Black |
|  |  | Senior Vice President |

---

[*Form 8-K for Closing of Transactions*]

## Exhibit 3.1

**Exhibit 3.1**

**AMENDED AND RESTATED**

**CERTIFICATE OF INCORPORATION**

**OF**

**SPIRIT AEROSYSTEMS HOLDINGS, INC.**

December 8, 2025

First. The name of the corporation is Spirit AeroSystems Holdings, Inc. (the "<u>Corporation</u>").

Second. The address of the Corporation's registered office in the State of Delaware is 251 Little Falls Drive, City of Wilmington, County of New Castle, Delaware 19808. The name of its registered agent at such address is Corporation Service Company.

Third. The purpose of the Corporation is to engage in any lawful act or activity for which corporations may be organized under the General Corporation Law of the State of Delaware, as amended (the "<u>DGCL</u>").

Fourth. The total number of shares that the Corporation shall have authority to issue is 1,000 shares of common stock, no par value.

Fifth. The board of directors of the Corporation is expressly authorized to adopt, amend or repeal bylaws of the Corporation.

Sixth. Elections of directors need not be by written ballot except and to the extent provided in the bylaws of the Corporation.

Seventh. The Corporation shall indemnify to the fullest extent permitted by Section 145 of the DGCL, each person who is or was a director of the Corporation and the heirs, executors and administrators of such directors; and the Corporation may, in its sole discretion, indemnify such other persons that such Section grants the Corporation the power to indemnify. No amendment to, modification of or repeal of this Article SEVENTH shall apply to or have any effect on the liability or alleged liability of any director or officer of the Corporation for or with respect to any acts or omissions of such director or officer occurring prior to any such amendment, modification or repeal.

Eighth. No director shall be personally liable to the Corporation or its stockholders for monetary damages for breach of fiduciary duty as a director for any act or omission occurring subsequent to the date when this provision becomes effective, except that he or she may be liable (i) for any breach of the director's duty of loyalty to the Corporation or its stockholders, (ii) for acts or omissions not in good faith or which involve intentional misconduct or a knowing violation of law, (iii) under Section 174 of the DGCL or (iv) for any transaction from which the director derived an improper personal benefit.

## Exhibit 3.2

**Exhibit 3.2**

**AMENDED AND RESTATED**

**BY-LAWS<br> OF<br> SPIRIT AEROSYSTEMS HOLDINGS, INC.,<br> a Delaware Corporation**

*(Adopted as of December 8, 2025)*

<u>ARTICLE I. OFFICES</u>

<u>Section 1. Registered Office</u>. The registered office of the corporation in the State of Delaware shall be located at 251 Little Falls Drive, City of Wilmington, County of New Castle, Delaware 19808. The name of the corporation's registered agent at such address shall be Corporation Service Company. The registered office and/or registered agent of the corporation may be changed from time to time by action of the corporation's Board of Directors (the "Board of Directors").

<u>Section 2. Other Offices</u>. The corporation may also have offices at such other places, both within and without the State of Delaware, as the Board of Directors may from time to time determine or the business of the corporation may require.

<u>ARTICLE II. MEETINGS OF STOCKHOLDERS</u>

<u>Section 1. Annual Meetings</u>. The annual meeting of stockholders shall be held on a date and at a time as determined by the Board of Directors, for the purpose of electing directors and transacting such other business as may properly come before the meeting.

<u>Section 2. Special Meetings</u>. Special meetings of stockholders may be called for any purpose and may be held at such time and place, within or without the State of Delaware, and/or by means of remote communication, as shall be stated in a written notice of meeting or in a duly executed waiver of notice thereof. Such meetings may be called at any time by the Board of Directors or the President and shall be called by the President upon the written request of holders of shares entitled to cast not less than fifty percent (50%) of the votes at the meeting, which written request shall state the purpose or purposes of the meeting and shall be delivered to the President.

<u>Section 3. Place of Meetings</u>. The Board of Directors, in its sole discretion, may designate any place, either within or without the State of Delaware, and/or by means of remote communication, as the place of meeting for any annual meeting or for any special meeting called by the Board of Directors. If no designation is made, or if a special meeting be otherwise called, the place of meeting shall be the principal executive office of the corporation.

<u>Section 4. Notice</u>. Whenever stockholders are required or permitted to take any action at a meeting, written or printed notice stating the place, if any, date and hour of the meeting, the means of remote communications, if any, by which stockholders and proxy holders may be deemed to be present in person and vote at such meeting, and, in the case of special meetings, the purpose or purposes, of such meeting, shall be given to each stockholder entitled to vote at such meeting not less than ten (10) nor more than sixty (60) days before the date of the meeting. All such notices shall be delivered, either personally, by mail, or by a form of electronic transmission consented to by the stockholder to whom the notice is given, by or at the direction of the Board of Directors, the President or the Secretary, and if mailed, such notice shall be deemed to be delivered when deposited in the United States mail, postage prepaid, addressed to the stockholder at his, her or its address as the same appears on the records of the corporation. If given by electronic transmission, such notice shall be deemed to be delivered (a) if by facsimile telecommunication, when directed to a number at which the stockholder has consented to receive notice; (b) if by electronic mail, when directed to an electronic mail address at which the stockholder has consented to receive notice; (c) if by a posting on an electronic network together with separate notice to the stockholder of such specific posting, upon the later of (1) such posting, and (2) the giving of such separate notice, and (d) if by any other form of electronic transmission, when directed to the stockholder. Any such consent shall be revocable by the stockholder by written notice to the corporation. Any such consent shall be deemed revoked if (x) the corporation is unable to deliver by electronic transmission two (2) consecutive notices given by the corporation in accordance with such consent and (y) such inability becomes known to the Secretary or an Assistant Secretary of the corporation or to the transfer agent. Attendance of a person at a meeting shall constitute a waiver of notice of such meeting, except when the person attends for the express purpose of objecting at the beginning of the meeting to the transaction of any business because the meeting is not lawfully called or convened.

<u>Section 5. Stockholders List</u>. The officer who has charge of the stock ledger of the corporation shall make, at least ten (10) days before each meeting of the stockholders, a complete list of the stockholders entitled to vote at such meeting, arranged in alphabetical order, showing the address of each stockholder and the number of shares registered in the name of each stockholder. Such list shall be open to the examination of any stockholder, for any purpose germane to the meeting, for a period of at least ten (10) days prior to the meeting: (a) on a reasonably accessible electronic network, provided that the information required to gain access to such list is provided with the notice of the meeting, and/or (b) during ordinary business hours, at the principal place of business of the corporation.

<u>Section 6. Quorum; Required Vote</u>. At all meetings of the stockholders, except as otherwise provided by applicable law, the certificate of incorporation of the Corporation (as amended, restated, or amended and restated from time to time, the "Certificate of Incorporation") or these by-laws, the presence, in person or by proxy, of the holders of one-third of the outstanding shares of capital stock entitled to vote shall constitute a quorum for the transaction of business; and except as otherwise provided by the Certificate of Incorporation, these by-laws, or applicable law, the affirmative vote of the holders of a majority of the shares present in person or by proxy at the meeting and entitled to vote on the subject matter shall be the act of and binding upon all stockholders. Whether a quorum exists or not, the chair of the meeting or a majority of the shares present in person or by proxy and entitled to vote may adjourn the meeting to another time and place. At any such adjourned meeting at which a quorum shall be present, any business may be transactions which might have been transacted at the meeting as originally called. Unless otherwise provided by statute, no notice of an adjourned meeting need be given.

<u>Section 7. Proxies</u>. Each stockholder entitled to vote at a meeting of stockholders or to express consent or dissent to corporate action in writing without a meeting may authorize another person or persons to act for such stockholder by proxy, but no such proxy shall be voted or acted upon after three (3) years from its date, unless the proxy provides for a longer period. At each meeting of the stockholders, and before any voting commences, all proxies filed at or before the meeting shall be submitted to and examined by the Secretary or a person designated by the Secretary, and no shares may be represented or voted under a proxy that has been found to be invalid or irregular.

<u>Section 8. Action by Written Consent</u>. Unless otherwise provided in the Certificate of Incorporation, any action which could be taken at any annual or special meeting of stockholders of the corporation may be taken without a meeting, without prior notice, and without a vote, if a consent or consents in writing, setting forth the action so taken, are (a) signed by the holders of outstanding capital stock having not fewer than the minimum number of votes that would be necessary to authorize or take such action at a meeting at which all shares entitled to vote thereon were present and voted and (b) delivered to the corporation by delivery to its registered office in the state of Delaware, its principal place of business, or an officer or agent of the corporation having custody of the records of proceedings of meetings of the stockholders. Delivery made to the corporation's registered office shall be by hand or by certified or registered mail, return receipt requested or by reputable overnight courier service. All consents properly delivered in accordance with this section shall be deemed to be recorded when so delivered. No written consent shall be effective to take the corporate action referred to therein unless, within sixty (60) (or the maximum number permitted by applicable law) days after the earliest dated consent delivered to the corporation as required by this section, written consents signed by the holders of a sufficient number of shares to take such corporate action are so recorded. Prompt notice of the taking of the corporate action without a meeting by less than unanimous written consent shall be given to those stockholders who have not consented in writing. Any action taken pursuant to such written consent or consents of the stockholders shall have the same force and effect as if taken by the stockholders at a meeting thereof.

Any copy, facsimile or other reliable reproduction of a consent in writing may be substituted or used in lieu of the original writing for any and all purposes for which the original writing could be used; provided that such copy, facsimile or other reproduction shall be a complete reproduction of the entire original writing.

<u>Section 9. Action by Telegram, Cablegram or Other Electronic Transmission Consent</u>. A telegram, cablegram or other electronic transmission consenting to an action to be taken and transmitted by a stockholder or proxy holder, or by a person or persons authorized to act for a stockholder or proxy holder, shall be deemed to be written, signed and dated for the purposes of this section; provided that any such telegram, cablegram or other electronic transmission sets forth or is delivered with information from which the corporation can determine (a) that the telegram, cablegram or other electronic transmission was transmitted by the stockholder or proxy holder or by a person or persons authorized to act for the stockholder or proxy holder and (b) the date on which such stockholder or proxy holder or authorized person or persons transmitted such telegram, cablegram or electronic transmission. The date on which such telegram, cablegram or electronic transmission is transmitted shall be deemed to be the date on which such consent was signed. No consent given by telegram, cablegram or other electronic transmission shall be deemed to have been delivered until such consent is reproduced in paper form and until such paper form shall be delivered to the corporation by delivery to its registered office in the State of Delaware, its principal place of business or an officer or agent of the corporation having custody of the book in which proceedings of meetings of stockholders are recorded if, to the extent and in the manner provided by resolution of the Board of Directors.

<u>ARTICLE III. DIRECTORS</u>

<u>Section 1. Number, Election and Term of Office</u>. The Board of Directors shall consist of one (1) or more members, the number thereof to be determined from time to time by resolution of the Board of Directors. The directors shall be elected by the affirmative vote of the holders of a majority of the shares present in person or represented by proxy at the meeting and entitled to vote in the election of directors. The directors shall be elected in this manner at the annual meeting of the stockholders, except as provided in <u>Section 3</u> of this <u>Article III</u>. Each director elected shall hold office until a successor is duly elected and qualified or until his or her earlier death, resignation or removal as hereinafter provided.

<u>Section 2. Removal and Resignation</u>. Any director or the entire Board of Directors may be removed at any time, with or without cause, by the affirmative vote of the holders of record of a majority of the outstanding shares of capital stock entitled to vote, at a duly constituted meeting of stockholders called for that purpose. Any director may resign at any time upon written notice given to the corporation. A resignation is effective when the resignation is delivered, unless the resignation specifies a later effective date.

<u>Section 4. Annual Meetings</u>. An annual meeting of the Board of Directors shall be held immediately after, and at the same place, if any, as the annual meeting of stockholders. No notice of such annual meeting of the Board of Directors is required. Such annual meeting may be held at any other time or place which shall be specified in a notice given as hereinafter provided for special meetings of the Board of Directors, or in a consent and waiver of notice thereof, signed by all the directors.

<u>Section 5. Other Meetings and Notice</u>. Regular meetings, other than the annual meeting, of the Board of Directors may be held without notice at such time and at such place, if any, as shall from time to time be determined by resolution of the Board of Directors and promptly communicated to all directors then in office.

<u>Section 6. Quorum, Required Vote and Adjournment</u>. Except as herein otherwise provided, one-third of the total number of directors fixed by or in the manner provided for in these by-laws at the time of any meeting of the Board of Directors or, if vacancies exist on the Board of Directors, one-third of such number of directors then in office, shall constitute a quorum for the transaction of business; and, except as otherwise required by statute, the Certificate of Incorporation, or these by-laws, the act of a majority of the directors present at any such meeting at which a quorum is present shall be the act of the Board of Directors. In the absence of a quorum, a majority of the directors present may adjourn any meeting, from time to time, until a quorum is present. No notice of any adjourned meeting need be given.

<u>Section 7. Committees</u>. The Board of Directors may designate one or more committees, each committee to consist of one or more of the directors of the corporation, which to the extent provided in such resolution or these by-laws shall have and may exercise the powers of the Board of Directors in the management and affairs of the corporation, except as otherwise limited by law. The Board of Directors may designate one or more directors as alternate members of any committee, who may replace any absent or disqualified member at any meeting of the committee. Such committee or committees shall have such name or names as may be determined from time to time by resolution adopted by the Board of Directors. Each committee shall keep regular minutes of its meetings and report the same to the Board of Directors when required.

<u>Section 8. Committee Rules</u>. Each committee of the Board of Directors may fix its own rules of procedure and shall hold its meetings as provided by such rules, except as may otherwise be provided by a resolution of the Board of Directors designating such committee. In the event that a member and that member's alternate, if alternates are designated by the Board of Directors as provided in <u>Section 7</u> of this <u>Article III</u>, of such committee is or are absent or disqualified, the member or members thereof present at any meeting and not disqualified from voting, whether or not such member or members constitute a quorum, may unanimously appoint another member of the Board of Directors to act at the meeting in place of any such absent or disqualified member.

<u>Section 9. Communications Equipment</u>. Members of the Board of Directors or any committee thereof may participate in and act at any meeting of the Board of Directors or committee by means of conference telephone or other communications equipment by means of which all persons participating in the meeting can hear each other, and participation in the meeting pursuant to this section shall constitute presence in person at the meeting.

<u>Section 10. Waiver of Notice and Presumption of Assent</u>. Any member of the Board of Directors or any committee thereof who is present at a meeting shall be conclusively presumed to have waived notice of such meeting, except when such member attends for the express purpose of objecting at the beginning of the meeting to the transaction of any business because the meeting is not lawfully called or convened. Such member shall be conclusively presumed to have assented to any action taken unless his or her dissent shall be entered in the minutes of the meeting or unless his or her written dissent to such action shall be filed with the person acting as the secretary of the meeting before the adjournment thereof or shall be forwarded by registered mail to the Secretary immediately after the adjournment of the meeting. Such right to dissent shall not apply to any member who voted in favor of such action.

<u>Section 11. Action by Written Consent</u>. Unless otherwise restricted by the Certificate of Incorporation, any action required or permitted to be taken at any meeting of the Board of Directors, or of any committee thereof, may be taken without a meeting if all members of the Board of Directors or committee, as the case may be, consent thereto in writing or by electronic transmission, and the writing or writings or electronic transmission or transmissions are filed with the minutes of proceedings of the Board of Directors, or committee. Such filing shall be in paper form if the minutes are maintained in paper form and shall be in electronic form if the minutes are maintained in electronic form.

<u>ARTICLE IV. OFFICERS</u>

<u>Section 1. Number</u>. The officers of the corporation shall be elected by the Board of Directors and shall consist of a President, a Treasurer, and a Secretary. A Chair of the Board, one or more Vice Presidents and such other officers and assistant officers as may be deemed necessary or desirable may be elected or appointed by the Board of Directors. Any number of offices may be held by the same person. In its discretion, the Board of Directors may choose not to fill any office for any period as it may deem advisable.

<u>Section 2. Election and Term of Office</u>. Vacancies may be filled or new offices created and filled at any meeting of the Board of Directors. Each officer shall hold office until a successor is duly elected and qualified or until his or her earlier death, resignation or removal as hereinafter provided.

<u>Section 3. Removal and Resignation</u>. Any officer or agent elected by the Board of Directors may be removed by the Board of Directors whenever in its judgment the best interests of the corporation would be served thereby, but such removal shall be without prejudice to the contract rights, if any, of the person so removed. Any officer may resign at any time upon written notice given to the corporation. A resignation is effective when the resignation is delivered, unless the resignation specifies a later effective date.

<u>Section 4. Vacancies</u>. Any vacancy occurring in any office because of death, resignation, removal, disqualification, or otherwise, may be filled by the Board of Directors for the unexpired portion of the term by the Board of Directors then in office.

<u>Section 5. Chair of the Board</u>. The Chair of the Board, if elected, shall be chosen from among the directors. The Chair shall preside, when present, at all meetings of the stockholders and at all meetings of the Board of Directors and shall have such other powers and duties as may from time to time be prescribed by the Board of Directors.

<u>Section 6. President</u>. The President shall be the chief executive officer of the corporation unless some other officer is so designated by the Board of Directors, and shall preside at all meetings of the stockholders and Board of Directors at which he or she is present; subject to the powers of the Board of Directors, shall have general charge of the business, affairs and property of the corporation, and control over its officers, agents and employees; and shall see that all orders and resolutions of the Board of Directors are carried into effect. The President shall execute bonds, mortgages and other contracts requiring a seal, under the seal of the corporation, except where required or permitted by law to be otherwise signed and executed and except where the signing and execution thereof shall be expressly delegated by the Board of Directors to some other officer or agent of the corporation. The President shall have such other powers and perform such other duties as may be prescribed by the Board of Directors or as may be provided in these by-laws.

<u>Section 7. Vice-President(s)</u>. The Vice-President, or if there shall be more than one, the Vice-Presidents in the order determined by the Board of Directors, shall, in the absence or disability of the President, act with all of the powers and be subject to all the restrictions of the President. The Vice-Presidents shall also perform such other duties and have such other powers as the Board of Directors, the President or these by-laws may, from time to time, prescribe.

<u>Section 8. The Secretary and Assistant Secretaries</u>. The Secretary shall attend to the giving of notice of all meetings of stockholders and of the Board of Directors and shall keep and attest true records of all such proceedings. The Secretary shall have such powers and perform such duties as the Board of Directors, the President or these by-laws may, from time to time, prescribe. The Assistant Secretary, or if there be more than one, the Assistant Secretaries in the order determined by the Board of Directors, shall, in the absence or disability of the Secretary, perform the duties and exercise the powers of the Secretary and shall perform such other duties and have such other powers as the Board of Directors, the President, or Secretary may, from time to time, prescribe.

<u>Section 9. The Treasurer and Assistant Treasurer</u>. The Treasurer shall keep and maintain custody of the corporate funds and securities; shall keep full and accurate accounts of receipts and disbursements in books belonging to the corporation; shall deposit all monies and other valuable effects in the name and to the credit of the corporation as may be ordered by the Board of Directors; shall cause the funds of the corporation to be disbursed when such disbursements have been duly authorized, taking proper vouchers for such disbursements; and shall render to the Board of Directors, at its regular meeting or when the Board of Directors so requires, an account of the corporation; and shall have such powers and perform such duties as the Board of Directors, the President or these by-laws may, from time to time, prescribe. The Assistant Treasurer, or if there shall be more than one, the Assistant Treasurers in the order determined by the Board of Directors, shall in the absence or disability of the Treasurer, perform the duties and exercise the powers of the Treasurer. The Assistant Treasurers shall perform such other duties and have such other powers as the Board of Directors, the President or Treasurer may, from time to time, prescribe.

<u>Section 10. Other Officers, Assistant Officers, and Agents</u>. Officers, assistant officers, and agents, if any, other than those whose duties are provided for in these by-laws, shall have such authority and perform such duties as may from time to time be prescribed by resolution of the Board of Directors.

<u>Section 11. Absence or Disability of Officers</u>. In the case of the absence or disability of any officer of the corporation and of any person hereby authorized to act in such officer's place during such officer's absence or disability, the Board of Directors may by resolution delegate the powers and duties of such officer to any other officer or to any director, or to any other person whom it may select.

<u>ARTICLE V. CERTIFICATES OF STOCK</u>

<u>Section 1. Issuance of Stocks</u>. The shares of the corporation shall be represented by certificates, provided that the Board of Directors may provide by resolution or resolutions that some or all of any or all classes or series of its stock shall be uncertificated shares. Any such resolution shall not apply to shares represented by certificate until such certificate is surrendered to the corporation. No shares of the corporation shall be issued unless authorized by the Board of Directors, which authorization shall include the maximum number of shares authorized for issuance and the consideration to be received for each share. Every holder of capital stock in the corporation represented by a certificate shall be entitled to have a certificate, signed by the President or a Vice-President and the Secretary or an Assistant Secretary or the Treasurer or an Assistant Treasurer, certifying the number of shares owned by the stockholder in the corporation. In the event any officer or officers who have signed, or whose facsimile signature or signatures have been used on, any such certificate or certificates shall cease to be such officer or officers of the corporation whether because of death, resignation or otherwise before such certificate or certificates have been delivered by the corporation, such certificate or certificates may nevertheless be issued and delivered as though the person or persons who signed such certificate or certificates or whose facsimile signature or signatures have been used thereon had not ceased to be such officer or officers of the corporation. Shares of stock may be transferred by delivery of the certificates therefor, accompanied either by an assignment in writing on the back of the certificates or by written power of attorney to sell, assign, and transfer the same, signed by the record holder thereof (or, with respect to uncertificated shares, by delivery of duly executed instructions or in any other manner permitted by law), but no transfer shall affect the right of the corporation to pay any dividend upon the stock to the holder of record thereof, or to treat the holder of record as the holder in fact thereof for all purposes, and no transfer shall be valid, except between the parties thereto, until such transfer shall have been made upon the books of the corporation. The Board of Directors may appoint a bank or trust company organized under the laws of the United States or any state thereof to act as its transfer agent or registrar, or both in connection with the transfer of any class or series of securities of the corporation.

<u>Section 2. Lost Certificates</u>. The Board of Directors may provide for the issuance of new certificates of stock or uncertificated shares to replace certificates of stock lost, stolen, mutilated, or destroyed, or alleged to be lost, stolen, mutilated, or destroyed, upon such terms and in accordance with such procedures as the Board of Directors shall deem proper and prescribe.

<u>Section 3. Fixing a Record Date</u>. For the purpose of determining stockholders entitled to notice of and to vote at any meeting of stockholders, action by written consent, or any adjournment thereof, the Board of Directors may fix a record date, which record date shall not precede the date on which the resolution fixing the record date is adopted by the Board of Directors, and which record date shall not be more than sixty (60) nor fewer than ten (10) days before the date of such meeting. If no record date is fixed by the Board of Directors, the record date for determining stockholders entitled to notice of and to vote at a meeting of stockholders or action by written consent shall be the close of business on the day next preceding the day on which notice is given, or if notice is waived, at the close of business on the day next preceding the day on which the meeting is held. A determination of stockholders of record entitled to notice of and to vote at a meeting of stockholders shall apply to any adjournment of the meeting; provided, however, that the Board of Directors may fix a new record date for the adjourned meeting.

<u>ARTICLE VI. GENERAL PROVISIONS</u>

<u>Section 1. Dividends</u>. Dividends upon the capital stock of the corporation, subject to the provisions of the Certificate of Incorporation, if any, may be declared by the Board of Directors at any regular or special meeting, pursuant to law. Dividends may be paid in cash, in property, or in shares of capital stock of the corporation, subject to the provisions of the Certificate of Incorporation. Before payment of any dividend, there may be set aside out of any funds of the corporation available for dividends such sum or sums as the Board of Directors from time to time, in its absolute discretion, deems proper as a reserve or reserves to meet contingencies, or for equalizing dividends, or for repairing or maintaining any property of the corporation, or any other purpose and the Board of Directors may modify or abolish any such reserve in the manner in which it was created.

<u>Section 2. Checks, Drafts or Orders</u>. All checks, drafts, or other orders for the payment of money by or to the corporation and all notes and other evidences of indebtedness issued in the name of the corporation shall be signed by such officer or officers, agent or agents of the corporation, and in such manner, as shall be determined by resolution of the Board of Directors or a duly authorized committee thereof.

<u>Section 3. Contracts</u>. The Board of Directors may authorize any officer or officers, or any agent or agents, of the corporation to enter into any contract or to execute and deliver any instrument in the name of and on behalf of the corporation, and such authority may be general or confined to specific instances.

<u>Section 4. Fiscal Year</u>. The fiscal year of the corporation shall be the calendar year unless fixed by resolution of the Board of Directors.

<u>Section 5. Corporate Seal</u>. The Board of Directors may provide a corporate seal which shall be in the form of a circle and shall have inscribed thereon the name of the corporation and the words "Corporate Seal, Delaware." The seal may be used by causing it or a facsimile thereof to be impressed, affixed, reproduced or otherwise.

<u>Section 6. Voting Securities Owned By Corporation</u>. Voting securities in any other corporation held by the corporation shall be voted by the President, unless the Board of Directors specifically confers authority to vote with respect thereto, which authority may be general or confined to specific instances, upon some other person or officer. Any person authorized to vote securities shall have the power to appoint proxies, with general power of substitution.

<u>Section 7. Indemnification of Directors and Officers</u>.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a) Each person who was or is made a party or is threatened to be made a party to or is involved in any threatened, pending or completed action, suit or proceeding, whether civil, criminal, administrative or investigative (a "Proceeding"), by reason of the fact that he or she, or a person for whom he or she is the legal representative, is or was a director or officer of the Corporation or, as a director or officer of the Corporation, is or was serving at the written request of the Board of Directors or its designee as a director, officer, employee or agent of another corporation, partnership, joint venture, trust or other enterprise, including service with respect to employee benefit plans (an "Indemnitee"), whether the basis of such Proceeding is alleged action in an official capacity as a director, officer, trustee, employee or agent or in any other capacity, shall be indemnified and held harmless by the Corporation to the fullest extent authorized by law, including but not limited to the General Corporation Law of the State of Delaware, as may be amended from time to time (the "DGCL"), as the same exists or may hereafter be amended (but, in the case of any such amendment, only to the extent that such amendment permits the Corporation to provide broader indemnification rights than permitted prior thereto), against all expenses, liabilities and loss (including attorneys' fees, judgments, fines, ERISA excise taxes or penalties and amounts paid settlement) actually and reasonably incurred or suffered by such Indemnitee in connection therewith; <u>provided</u>, <u>however</u>, that, except as otherwise provided in this section with respect to Proceedings to enforce rights to indemnification or Advancement of Expenses (as hereinafter defined), the Corporation shall indemnify any such Indemnitee in connection with a Proceeding (or part thereof) initiated by such Indemnitee only if such Proceeding (or part thereof) was authorized by the Board of Directors.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b) Any Indemnitee shall also have the right to be paid by the Corporation the expenses (including attorneys' fees) incurred by him or her in defending any Proceeding in advance of a final disposition ("Advancement of Expenses") so long as the Corporation shall have received an undertaking by or on behalf of such Indemnitee to repay such amounts (an "Undertaking") if it shall ultimately be determined by a court or other tribunal that such Indemnitee is not entitled to be indemnified for such expenses under this section or otherwise, or where indemnification is granted, to the extent the expenses so advanced or reimbursed exceed the amount to which such person is entitled.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(c) If an amount properly owed to an Indemnitee under this section is not paid in full by the Corporation within thirty days after a written claim has been received by the Corporation in respect thereof, the Indemnitee may at any time thereafter bring suit against the Corporation to recover such unpaid amounts. If successful in whole or in part in any such suit, or in a suit brought by the Corporation to recover an Advancement of Expenses pursuant to the terms of an Undertaking, the Indemnitee shall also be entitled to be paid the actual expense incurred in prosecuting or defending such suit. In any such action, the burden of proof shall be on the Corporation to prove the claimant is not entitled to such payment.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(d) Neither the failure of the Corporation (including its Board of Directors, independent legal counsel, or its stockholders) to have made a determination prior to the commencement of such action that the claimant is entitled to indemnification or Advancement of Expenses under the circumstances, nor an actual determination by the Corporation (including its Board of Directors, independent legal counsel, or its stockholders) that the claimant is not entitled to indemnification or advancement, shall be a defense to the action or create a presumption that the claimant is not entitled to indemnification or Advancement of Expenses.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(e) The right to be indemnified or to the reimbursement or Advancement of Expenses pursuant hereto (i) is a contract right based upon good and valuable consideration, pursuant to which the Indemnitee entitled thereto may bring suit as if the provisions hereof were set forth in a separate written contract between the Corporation and the Indemnitee, (ii) is intended to be retroactive and shall be available with respect to events occurring prior to the adoption hereof, and (iii) shall continue to exist after the rescission or restrictive modification hereof with respect to events occurring prior thereto.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(f) Any director or officer of the Corporation serving, in any capacity, and any other person serving as director or officer of, (i) another organization of which a majority of the outstanding voting securities representing the present right to vote for the election of its directors or equivalent executives is owned directly or indirectly by the Corporation, or (ii) any employee benefit plan of the Corporation or of any organization referred to in clause (i), shall be deemed to be doing so at the written request of the Board of Directors.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(g) The rights to indemnification and to the Advancement of Expenses contemplated by this section shall not be exclusive of any other right that any Indemnitee may be entitled under these Bylaws, agreement, vote of stockholders of the Corporation or disinterested members of the Board of Directors or otherwise.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(h) The Corporation may maintain insurance, at its expense, to protect itself and any such director, officer, employee or agent of the Corporation or another corporation, partnership, joint venture, trust or other enterprise against such expense, liability or loss, whether or not the Corporation would have the power to indemnify such person against such expense, liability or loss under the DGCL.

<u>ARTICLE VII. AMENDMENTS</u>

<u>Section 1. Powers to Amend.</u> These by-laws may be amended, altered, or repealed and new by-laws, not inconsistent with any provision of the Certificate of Incorporation or any provision of law, may be adopted by the affirmative vote of a majority of the Board of Directors present at any meeting of the Board of Directors. The power to adopt, amend, alter, or repeal the by-laws which has been conferred upon the Board of Directors shall not divest the stockholders of the same powers.

## Exhibit 4.1

**Exhibit 4.1**

**EIGHTH SUPPLEMENTAL INDENTURE**

EIGHTH SUPPLEMENTAL INDENTURE (this "**Eighth Supplemental Indenture**"), dated as of December 8, 2025, among Spirit AeroSystems, Inc., a Delaware corporation (the "**Company**"), The Boeing Company, a Delaware corporation ("**Boeing**"), and The Bank of New York Mellon Trust Company, N.A., as trustee under the indenture referred to below (the "**Trustee**").

**RECITALS**

WHEREAS, the Company, Spirit AeroSystems Holdings, Inc., a Delaware corporation ("**Holdings**") and the Trustee entered into the Indenture, dated as of June 1, 2016 (the "**Original Indenture**"), providing for the issuance of the Company's 3.850% Senior Notes due 2026 (the "**Notes**"), as supplemented by (i) the Supplemental Indenture, dated as of December 5, 2016 (the "**First Supplemental Indenture**"), by and among the Company), Holdings, the subsidiary guarantors party thereto and the Trustee, (ii) the Second Supplemental Indenture, dated as of February 24, 2020 (the "**Second Supplemental Indenture**"), among the Company, Holdings, Spirit AeroSystems North Carolina, Inc., a North Carolina corporation ("**Spirit NC**"), and the Trustee, (iii) the Third Supplemental Indenture, dated as of April 17, 2020 (the "**Third Supplemental Indenture**"), among the Company, Holdings, Spirit NC and the Trustee, (iv) the Fourth Supplemental Indenture, dated as of October 5, 2020 (the "**Fourth Supplemental Indenture**"), among the Company, Holdings, Spirit NC and the Trustee, (v) the Fifth Supplemental Indenture, dated as of November 23, 2022 (the "**Fifth Supplemental Indenture**"), among the Company, Holdings, Spirit NC and the Trustee, (vi) the Sixth Supplemental Indenture, dated as of November 21, 2023 (the "**Sixth Supplemental Indenture**"), among the Company, Holdings, Spirit NC and the Trustee and (vii) the Seventh Supplemental Indenture, dated as of June 30, 2024 (the "**Seventh Supplemental Indenture**" and, together with the Original Indenture, the First Supplemental Indenture, the Second Supplemental Indenture, the Third Supplemental Indenture, the Fourth Supplemental Indenture, the Fifth Supplemental Indenture and the Sixth Supplemental Indenture, the "**Indenture**"), among the Company, Holdings, Spirit NC and the Trustee;

WHEREAS, on June 30, 2024, Holdings entered into an Agreement and Plan of Merger (as amended from time to time, the "**Merger Agreement**"), with Boeing and Sphere Acquisition Corp., a wholly owned subsidiary of Boeing ("**Merger Sub**"), pursuant to which, among other things, at the effective time of the Merger (the "**Effective Time**"), Merger Sub merged with and into Holdings (the "**Merger**"), with Holdings surviving the Merger as a wholly owned subsidiary of Boeing;

WHEREAS, on April 27, 2025, the Company and Airbus SE ("**Airbus**") entered into a Stock and Asset Purchase Agreement (as amended from time to time, the "**Purchase Agreement**") providing for, among other things, the acquisition by Airbus of certain of Holding's businesses, including the equity interests of Spirit NC;

WHEREAS, in connection with the consummation of the transactions contemplated by the Purchase Agreement, Spirit NC no longer guarantees (other than by virtue of its Note Guarantee) any Indebtedness under any Credit Facility or any other Indebtedness of Holdings or any of its Subsidiaries of at least $10.0 million;

WHEREAS, in connection with the consummation of the transactions contemplated by the Merger Agreement and the Purchase Agreement, including the payoff of the Company's term loan credit agreement and bridge credit agreement and the redemption of the Company's outstanding 9.375% Senior Secured First Lien Notes due 2029 and 9.750% Senior Secured Second Lien Notes due 2030, all Initial Liens granted by the Company have been released and discharged;

WHEREAS, in connection with the Merger and the other transactions contemplated by the Merger Agreement, Boeing desires to unconditionally guarantee the Company's obligations under the Notes, on the terms and subject to the conditions set forth in Article XI of the Indenture;

WHEREAS, pursuant to Section 9.01(f) of the Indenture, the Trustee and the Company are authorized to execute and deliver this Eighth Supplemental Indenture without the consent of any Holder of the Notes; and

WHEREAS, the Company hereby requests that the Trustee join in the execution and delivery of this Eighth Supplemental Indenture.

NOW THEREFORE, in consideration of the foregoing and for other good and valuable consideration, the receipt of which is hereby acknowledged, the Company, Boeing and the Trustee mutually covenant and agree for the equal and ratable benefit of the Holders of the Notes as follows:

&nbsp;&nbsp;&nbsp;&nbsp;1. <u>DEFINITIONS IN EIGHTH SUPPLEMENTAL INDENTURE</u>. All terms contained in this Eighth Supplemental Indenture
that are defined in the Indenture and not defined herein shall, for all purposes hereof, have the meanings given to such terms in the
Indenture, unless the context otherwise specifies or requires.

&nbsp;&nbsp;&nbsp;&nbsp;2. <u>AGREEMENT TO GUARANTEE</u>. Boeing hereby agrees to unconditionally guarantee the Company's obligations
under the Notes on the terms and subject to the conditions set forth in Article XI of the Indenture and to be bound by all other
applicable provisions of the Indenture and the Notes.

&nbsp;&nbsp;&nbsp;&nbsp;3. <u>RELEASE OF SPIRIT NC GUARANTEE</u>. As of the date hereof, Spirit NC is unconditionally released and
discharged from any obligations under its Note Guarantee.

&nbsp;&nbsp;&nbsp;&nbsp;4. <u>ACKNOWLEDGMENT OF RELEASE OF LIENS</u>. As of the date hereof, all Liens created for the benefit of
Holders of the Notes on assets of the Company that had secured the payment of principal and interest and all other amounts due and owing
pursuant to the terms of the Notes and the Indenture have been automatically and unconditionally released and discharged upon the release
and discharge of the Initial Liens pursuant to Section 4.08(b) of the Original Indenture.

&nbsp;&nbsp;&nbsp;&nbsp;5. <u>EFFECTIVENESS OF THIS SUPPLEMENTAL INDENTURE</u>. This Eighth Supplemental Indenture shall become effective
upon execution of counterparts hereof by each of the Company, Boeing and the Trustee.

&nbsp;&nbsp;&nbsp;&nbsp;6. <u>RATIFICATION OF INDENTURE; SUPPLEMENTAL INDENTURES PART OF INDENTURE</u>. Except as expressly
amended hereby, the Indenture is in all respects ratified and confirmed and all the terms, conditions and provisions thereof shall remain
in full force and effect. This Eighth Supplemental Indenture shall form a part of the Indenture for all purposes, and every Holder of
Notes heretofore or hereafter authenticated and delivered shall be bound hereby.

&nbsp;&nbsp;&nbsp;&nbsp;7. <u>GOVERNING LAW</u>. THIS EIGHTH SUPPLEMENTAL INDENTURE SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE
WITH, THE LAWS OF THE STATE OF NEW YORK.

&nbsp;&nbsp;&nbsp;&nbsp;8. <u>TRUSTEE</u>. The Trustee shall not be responsible in any manner whatsoever for or in respect of the
validity or sufficiency of this Eighth Supplemental Indenture or the recitals contained herein, all of which recitals are made solely
by the Company and Boeing. All of the provisions contained in the Indenture in respect of the rights, privileges, protections, immunities,
powers and duties of the Trustee shall be applicable in respect of this Eighth Supplemental Indenture as fully and with like force and
effect as though fully set forth in full herein.

&nbsp;&nbsp;&nbsp;&nbsp;9. <u>COUNTERPARTS</u>. This Eighth Supplemental Indenture may be executed in any number of counterparts,
each of which shall be an original, but such counterparts shall together constitute but one and the same instrument. The exchange of copies
of this Eighth Supplemental Indenture and of signature pages that are executed by manual signatures that are scanned, photocopied
or faxed or by other electronic signing created on an electronic platform (such as DocuSign) or by digital signing (such as Adobe Sign)
that is approved by the Trustee, shall constitute effective execution and delivery of this Eighth Supplemental Indenture for all purposes.
Signatures of the parties hereto that are executed by manual signatures that are scanned, photocopied or faxed or by other electronic
signing created on an electronic platform (such as DocuSign) or by digital signing (such as Adobe Sign) that is approved by the Trustee,
shall be deemed to be their original signatures for all purposes of this Eighth Supplemental Indenture as to the parties hereto and may
be used in lieu of the original.

Anything in the Indenture, the Notes or this Eighth Supplemental Indenture to the contrary notwithstanding, for the purposes of the transactions contemplated by this Eighth Supplemental Indenture, the Notes and any document to be signed in connection with the Indenture, this Eighth Supplemental Indenture or the Notes (including amendments, waivers, consents and other modifications, Officer's Certificates and Opinions of Counsel and other related documents) or the transactions contemplated hereby may be signed by manual signatures that are scanned, photocopied or faxed or other electronic signatures created on an electronic platform (such as DocuSign) or by digital signature (such as Adobe Sign) that is approved by the Trustee, and contract formations on electronic platforms approved by the Trustee, and the keeping of records in electronic form, are hereby authorized, and each shall be of the same legal effect, validity or enforceability as a manually executed signature in ink or the use of a paper-based recordkeeping system, as the case may be.

&nbsp;&nbsp;&nbsp;&nbsp;10. <u>EFFECT OF HEADINGS</u>. The Section headings herein are for convenience only and shall not affect
the construction thereof.

[*Signature Page Follows*]

IN WITNESS WHEREOF, the parties hereto have caused this Eighth Supplemental Indenture to be duly executed as of the date first written above.

---

| | |
|:---|:---|
| THE BOEING COMPANY | THE BOEING COMPANY |
| By: | /s/ David R. Whitehouse |
|  | Name: David R. Whitehouse |
|  | Title: Senior Vice President and Treasurer |

---

SPIRIT AEROSYSTEMS, INC.

---

| | |
|:---|:---|
| By: | /s/ Rhonda Harkins |
|  | Name: Rhonda Harkins |
|  | Title: Treasurer |

---

---

| | |
|:---|:---|
| THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A., as Trustee | THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A., as Trustee |
| By: | /s/ Ann M. Dolezal |
|  | Name: Ann M. Dolezal |
|  | Title: Vice President |

---

[*Signature page to Eighth Supplemental Indenture – 3.850% Senior Notes due 2026*]

## Exhibit 4.2

**Exhibit 4.2**

**FIRST SUPPLEMENTAL INDENTURE**

FIRST SUPPLEMENTAL INDENTURE (this "**First Supplemental Indenture**"), dated as of December 8, 2025, among Spirit AeroSystems, Inc., a Delaware corporation (the "**Company**"), The Boeing Company, a Delaware corporation ("**Boeing**"), and The Bank of New York Mellon Trust Company, N.A., as trustee under the indenture referred to below (the "**Trustee**").

**RECITALS**

WHEREAS, the Company, Spirit AeroSystems Holdings, Inc., a Delaware corporation ("**Holdings**") and the Trustee entered into the Indenture, dated as of May 30, 2018 (the "**Indenture**"), providing for the issuance of the Company's 4.600% Senior Notes due 2028 (the "**Notes**");

WHEREAS, on June 30, 2024, Holdings entered into an Agreement and Plan of Merger (as amended from time to time, the "**Merger Agreement**"), with Boeing and Sphere Acquisition Corp., a wholly owned subsidiary of Boeing ("**Merger Sub**"), pursuant to which, among other things, at the effective time of the Merger (the "**Effective Time**"), Merger Sub merged with and into Holdings (the "**Merger**"), with Holdings surviving the Merger as a wholly owned subsidiary of Boeing;

WHEREAS, pursuant to Section 9.01(f) of the Indenture, the Trustee and the Company are authorized to execute and deliver this First Supplemental Indenture without the consent of any Holder of the Notes; and

WHEREAS, the Company hereby requests that the Trustee join in the execution and delivery of this First Supplemental Indenture.

NOW THEREFORE, in consideration of the foregoing and for other good and valuable consideration, the receipt of which is hereby acknowledged, the Company, Boeing and the Trustee mutually covenant and agree for the equal and ratable benefit of the Holders of the Notes as follows:

&nbsp;&nbsp;&nbsp;&nbsp;1. <u>DEFINITIONS IN FIRST SUPPLEMENTAL INDENTURE</u>. All terms contained in this First Supplemental Indenture
that are defined in the Indenture and not defined herein shall, for all purposes hereof, have the meanings given to such terms in the
Indenture, unless the context otherwise specifies or requires.

&nbsp;&nbsp;&nbsp;&nbsp;2. <u>AGREEMENT TO GUARANTEE</u>. Boeing hereby agrees to unconditionally guarantee the Company's obligations
under the Notes on the terms and subject to the conditions set forth in Article XI of the Indenture and to be bound by all other
applicable provisions of the Indenture and the Notes.

&nbsp;&nbsp;&nbsp;&nbsp;3. <u>EFFECTIVENESS OF THIS SUPPLEMENTAL INDENTURE</u>. This First Supplemental Indenture shall become effective
upon execution of counterparts hereof by each of the Company, Boeing and the Trustee.

&nbsp;&nbsp;&nbsp;&nbsp;4. <u>RATIFICATION OF INDENTURE; SUPPLEMENTAL INDENTURES PART OF INDENTURE</u>. Except as expressly
amended hereby, the Indenture is in all respects ratified and confirmed and all the terms, conditions and provisions thereof shall remain
in full force and effect. This First Supplemental Indenture shall form a part of the Indenture for all purposes, and every Holder of Notes
heretofore or hereafter authenticated and delivered shall be bound hereby.

&nbsp;&nbsp;&nbsp;&nbsp;5. <u>GOVERNING LAW</u>. THIS FIRST SUPPLEMENTAL INDENTURE SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE
WITH, THE LAWS OF THE STATE OF NEW YORK.

&nbsp;&nbsp;&nbsp;&nbsp;6. <u>TRUSTEE</u>. The Trustee shall not be responsible in any manner whatsoever for or in respect of the
validity or sufficiency of this First Supplemental Indenture or the recitals contained herein, all of which recitals are made solely by
the Company and Boeing. All of the provisions contained in the Indenture in respect of the rights, privileges, protections, immunities,
powers and duties of the Trustee shall be applicable in respect of this First Supplemental Indenture as fully and with like force and
effect as though fully set forth in full herein.

&nbsp;&nbsp;&nbsp;&nbsp;7. <u>COUNTERPARTS</u>. This First Supplemental Indenture may be executed in any number of counterparts,
each of which shall be an original, but such counterparts shall together constitute but one and the same instrument. The exchange of copies
of this First Supplemental Indenture and of signature pages that are executed by manual signatures that are scanned, photocopied
or faxed or by other electronic signing created on an electronic platform (such as DocuSign) or by digital signing (such as Adobe Sign)
that is approved by the Trustee, shall constitute effective execution and delivery of this First Supplemental Indenture for all purposes.
Signatures of the parties hereto that are executed by manual signatures that are scanned, photocopied or faxed or by other electronic
signing created on an electronic platform (such as DocuSign) or by digital signing (such as Adobe Sign) that is approved by the Trustee,
shall be deemed to be their original signatures for all purposes of this First Supplemental Indenture as to the parties hereto and may
be used in lieu of the original.

Anything in the Indenture, the Notes or this First Supplemental Indenture to the contrary notwithstanding, for the purposes of the transactions contemplated by this First Supplemental Indenture, the Notes and any document to be signed in connection with the Indenture, this First Supplemental Indenture or the Notes (including amendments, waivers, consents and other modifications, Officer's Certificates and Opinions of Counsel and other related documents) or the transactions contemplated hereby may be signed by manual signatures that are scanned, photocopied or faxed or other electronic signatures created on an electronic platform (such as DocuSign) or by digital signature (such as Adobe Sign) that is approved by the Trustee, and contract formations on electronic platforms approved by the Trustee, and the keeping of records in electronic form, are hereby authorized, and each shall be of the same legal effect, validity or enforceability as a manually executed signature in ink or the use of a paper-based recordkeeping system, as the case may be.

&nbsp;&nbsp;&nbsp;&nbsp;8. <u>EFFECT OF HEADINGS</u>. The Section headings herein are for convenience only and shall not affect
the construction thereof.

[*Signature Page Follows*]

IN WITNESS WHEREOF, the parties hereto have caused this First Supplemental Indenture to be duly executed as of the date first written above.

---

| | |
|:---|:---|
| THE BOEING COMPANY | THE BOEING COMPANY |
| By: | /s/ David R. Whitehouse |
|  | Name: David R. Whitehouse |
|  | Title: Senior Vice President and Treasurer |

---

---

| | |
|:---|:---|
| SPIRIT AEROSYSTEMS, INC. | SPIRIT AEROSYSTEMS, INC. |
| By: | /s/ Rhonda Harkins |
|  | Name: Rhonda Harkins |
|  | Title: Treasurer |

---

---

| | |
|:---|:---|
| THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A., as Trustee | THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A., as Trustee |
| By: | /s/ Ann M. Dolezal |
|  | Name: Ann M. Dolezal |
|  | Title: Vice President |

---

[*Signature Page to First Supplemental Indenture – 4.600% Senior Notes due 2028*]

## Exhibit 4.3

**Exhibit 4.3**

**FIRST SUPPLEMENTAL INDENTURE**

FIRST SUPPLEMENTAL INDENTURE (this "**First Supplemental Indenture**"), dated as of December 8, 2025, among Spirit AeroSystems, Inc., a Delaware corporation (the "**Company**"), Spirit AeroSystems Holdings, Inc., a Delaware corporation ("**Holdings**"), The Boeing Company, a Delaware corporation ("**Boeing**"), and The Bank of New York Mellon Trust Company, N.A., as trustee under the indenture referred to below (the "**Trustee**").

**RECITALS**

WHEREAS, the Company, Holdings, Spirit AeroSystems North Carolina, Inc. ("**Spirit NC**") and the Trustee entered into the Indenture, dated as of November 13, 2023 (the "**Indenture**"), providing for the issuance of the Company's 3.250% Exchangeable Senior Notes due 2028 (the "**Notes**");

WHEREAS, on June 30, 2024, Holdings entered into an Agreement and Plan of Merger (as amended from time to time, the "**Merger Agreement**"), with Boeing and Sphere Acquisition Corp., a wholly owned subsidiary of Boeing ("**Merger Sub**"), pursuant to which, among other things, at the effective time of the Merger (the "**Effective Time**"), Merger Sub merged with and into Holdings (the "**Merger**"), with Holdings surviving the Merger as a wholly owned subsidiary of Boeing;

WHEREAS, in connection with the Merger, all of the capital stock of Spirit NC was sold to a Person that is not the Company or Holdings;

WHEREAS, on the terms and subject to the conditions set forth in the Merger Agreement, at the Effective Time, each share of Class A common stock, par value $0.01 per share, of Holdings ("**Spirit Common Stock**") issued and outstanding immediately prior to the Effective Time (subject to certain exceptions) was automatically cancelled and ceased to exist and was converted into the right to receive 0.1955 shares of common stock, par value $5.00 per share, of Boeing ("**Boeing Common Stock**") as set forth in the Merger Agreement;

WHEREAS, pursuant to Section 14.07 of the Indenture, the Merger constitutes a Share Exchange Event and the Company and Boeing shall execute with the Trustee a supplemental indenture providing for the change in the right to exchange each $1,000 principal amount of Notes for shares of Spirit Common Stock into the right to exchange each $1,000 principal amount of Notes for shares of Boeing Common Stock, in accordance with the terms of the Indenture;

WHEREAS, pursuant to Section 10.01 of the Indenture, the Company, the Guarantors and the Trustee are authorized to execute and deliver this First Supplemental Indenture without the consent of the Holders of any of the Notes; and

WHEREAS, the Company hereby requests that the Trustee join in the execution and delivery of this First Supplemental Indenture.

NOW THEREFORE, in consideration of the foregoing and for other good and valuable consideration, the receipt of which is hereby acknowledged, the Company, Holdings, Boeing and the Trustee mutually covenant and agree for the equal and ratable benefit of the Holders of the Notes as follows:

&nbsp;&nbsp;&nbsp;&nbsp;1. <u>DEFINITIONS IN FIRST SUPPLEMENTAL INDENTURE</u>. All terms contained in this First Supplemental Indenture
that are defined in the Indenture and not defined herein shall, for all purposes hereof, have the meanings given to such terms in the
Indenture, unless the context otherwise specifies or requires.

&nbsp;&nbsp;&nbsp;&nbsp;2. <u>CHANGE OF EXCHANGE RIGHT</u>. From and after the Effective Time and in accordance with the terms of
the Indenture, the right of Holders to exchange each $1,000 principal amount of Notes for shares of Spirit Common Stock shall be changed
into a right to exchange such principal amount of Notes into shares of Boeing Common Stock at an initial Exchange Rate of 6.7067 shares
of Boeing Common Stock (subject to adjustment as provided in Article 14 of the Indenture) per $1,000 principal amount of Notes (subject
to, and in accordance with, the settlement provisions of Section 14.02 of the Indenture).

&nbsp;&nbsp;&nbsp;&nbsp;3. <u>ANTI-DILUTION</u>. The anti-dilution and other adjustments provided under Article 14 of the Indenture
shall apply to the shares of Boeing Common Stock that constitute Reference Property under the Indenture, *provided, however*, that
all references to Stock Price in Article 14 of the Indenture shall be revised to the quotient of the original Stock Price provided
for in the Indenture and 0.1955, all references to Exchange Rate in Article 14 of the Indenture shall be revised to the product of
the original Exchange Rate and 0.1955 and all references to Additional Shares in Article 14 of the Indenture shall be revised to
be the product of the original number of Additional Shares and 0.1955.

&nbsp;&nbsp;&nbsp;&nbsp;4. <u>RELEASE OF SPIRIT NC GUARANTEE</u>. As of the date hereof, Spirit NC is unconditionally released and discharged from any obligations
under its Guarantee of the Notes.

&nbsp;&nbsp;&nbsp;&nbsp;5. <u>EFFECTIVENESS OF THIS SUPPLEMENTAL INDENTURE</u>. This First Supplemental Indenture shall become effective
upon execution of counterparts hereof by each of the Company, Holdings, Boeing and the Trustee.

&nbsp;&nbsp;&nbsp;&nbsp;6. <u>RATIFICATION OF INDENTURE; SUPPLEMENTAL INDENTURES PART OF INDENTURE</u>. Except as expressly
amended hereby, the Indenture is in all respects ratified and confirmed and all the terms, conditions and provisions thereof shall remain
in full force and effect. This First Supplemental Indenture shall form a part of the Indenture for all purposes, and every Holder of Notes
heretofore or hereafter authenticated and delivered shall be bound hereby.

&nbsp;&nbsp;&nbsp;&nbsp;7. <u>GOVERNING LAW</u>. THIS FIRST SUPPLEMENTAL INDENTURE SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE
WITH, THE LAWS OF THE STATE OF NEW YORK.

&nbsp;&nbsp;&nbsp;&nbsp;8. <u>TRUSTEE</u>. The Trustee shall not be responsible in any manner whatsoever for or in respect of the
validity or sufficiency of this First Supplemental Indenture or the recitals contained herein, all of which recitals are made solely by
the Company, Holdings and Boeing. All of the provisions contained in the Indenture in respect of the rights, privileges, protections,
immunities, powers and duties of the Trustee shall be applicable in respect of this First Supplemental Indenture as fully and with like
force and effect as though fully set forth in full herein.

&nbsp;&nbsp;&nbsp;&nbsp;9. <u>COUNTERPARTS</u>. This First Supplemental Indenture may be executed in any number of counterparts,
each of which shall be an original, but such counterparts shall together constitute but one and the same instrument. The exchange of copies
of this First Supplemental Indenture and of signature pages that are executed by manual signatures that are scanned, photocopied
or faxed or by other electronic signing created on an electronic platform (such as DocuSign) or by digital signing (such as Adobe Sign)
that is approved by the Trustee, shall constitute effective execution and delivery of this First Supplemental Indenture for all purposes.
Signatures of the parties hereto that are executed by manual signatures that are scanned, photocopied or faxed or by other electronic
signing created on an electronic platform (such as DocuSign) or by digital signing (such as Adobe Sign) that is approved by the Trustee,
shall be deemed to be their original signatures for all purposes of this First Supplemental Indenture as to the parties hereto and may
be used in lieu of the original.

Anything in the Indenture, the Notes or this First Supplemental Indenture to the contrary notwithstanding, for the purposes of the transactions contemplated by this First Supplemental Indenture, the Notes and any document to be signed in connection with the Indenture, this First Supplemental Indenture or the Notes (including amendments, waivers, consents and other modifications, Officer's Certificates and Opinions of Counsel and other related documents) or the transactions contemplated hereby may be signed by manual signatures that are scanned, photocopied or faxed or other electronic signatures created on an electronic platform (such as DocuSign) or by digital signature (such as Adobe Sign) that is approved by the Trustee, and contract formations on electronic platforms approved by the Trustee, and the keeping of records in electronic form, are hereby authorized, and each shall be of the same legal effect, validity or enforceability as a manually executed signature in ink or the use of a paper-based recordkeeping system, as the case may be.

&nbsp;&nbsp;&nbsp;&nbsp;10. <u>EFFECT OF HEADINGS</u>. The Section headings herein are for convenience only and shall not affect
the construction thereof.

[*Signature Page Follows*]

IN WITNESS WHEREOF, the parties hereto have caused this First Supplemental Indenture to be duly executed as of the date first written above.

---

| | | |
|:---|:---|:---|
| THE BOEING COMPANY | THE BOEING COMPANY | THE BOEING COMPANY |
| By: | /s/ David Whitehouse | /s/ David Whitehouse |
|  | Name: | David Whitehouse |
|  | Title: | Senior Vice President and Treasurer |

---

---

| | | |
|:---|:---|:---|
| SPIRIT AEROSYSTEMS, INC. | SPIRIT AEROSYSTEMS, INC. | SPIRIT AEROSYSTEMS, INC. |
| By: | /s/ Rhonda Harkins | /s/ Rhonda Harkins |
|  | Name: | Rhonda Harkins |
|  | Title: | Treasurer |

---

---

| | | |
|:---|:---|:---|
| SPIRIT AEROSYSTEMS HOLDINGS, INC. | SPIRIT AEROSYSTEMS HOLDINGS, INC. | SPIRIT AEROSYSTEMS HOLDINGS, INC. |
| By: | /s/ Rhonda Harkins | /s/ Rhonda Harkins |
|  | Name: | Rhonda Harkins |
|  | Title: | Treasurer |

---

---

| | | |
|:---|:---|:---|
| THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A., as Trustee | THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A., as Trustee | THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A., as Trustee |
| By: | /s/ Ann M. Dolezal | /s/ Ann M. Dolezal |
|  | Name: | Ann M. Dolezal |
|  | Title: | Vice President |

---

[*Signature Page to First Supplemental Indenture – 3.250% Exchangeable Senior Notes due 2028*]

## Exhibit 99.1

**Exhibit 99.1**

![](tm2532915d1_ex99-1img001.jpg)

**Boeing Completes Acquisition of Spirit AeroSystems**

- Transaction underscores commitment to aviation safety and airplane quality while strengthening commercial production and supply chain stability

- Major operations align under Commercial Airplanes, aftermarket aligns under Global Services, defense programs to operate independently

- Spirit Defense established to ensure continuity for teammates, uninterrupted support for U.S. defense and space programs

**ARLINGTON, Va., Dec. 8, 2025 —** Boeing [NYSE: BA] today announced it has completed its acquisition of Spirit AeroSystems [NYSE: SPR].

"This is a pivotal moment in Boeing's history and future success as we begin to integrate Spirit AeroSystems' commercial and aftermarket operations and establish Spirit Defense," said Kelly Ortberg, president and chief executive officer of The Boeing Company. "As we welcome our new teammates and bring our two companies together, our focus is on maintaining stability so we can continue delivering high quality airplanes, differentiated services, and advanced defense capabilities for our customers and the industry."

Boeing's acquisition includes all of Spirit's Boeing-related commercial operations, including fuselages for the 737 program and major structures for the 767, 777 and 787 Dreamliner. It also includes commercially procured fuselages for the P-8 and KC-46.

The transaction also brings Boeing's largest supplier of spare parts in house, expands Boeing's global maintenance, repair and overhaul services footprint and adds to Boeing's rotable, lease, and exchange portfolio with Spirit's aftermarket businesses.

Spirit Defense will continue to support its customers as an independent supplier to the defense industry to ensure uninterrupted support for its customers. It will act as a non-integrated subsidiary of Boeing Defense, Space & Security, aligning for financial reporting and select enterprise functional and site support, but maintaining independent governance and operations.

In addition, portions of Spirit AeroSystems' operations in Belfast, Northern Ireland, have been acquired by Boeing, and the Belfast site will operate as an independent subsidiary branded as Short Brothers, a Boeing Company.

Spirit AeroSystems' commercial and aftermarket operations in Wichita, Kansas; Dallas, Texas; and Tulsa, Oklahoma, as well as Spirit's Aerospace Innovation Center in Prestwick, Scotland, will begin to integrate into Boeing. Approximately 15,000 teammates across the five sites are becoming a part of Boeing.

"Kansas' aviation expertise reaches far beyond our borders," said Kansas Governor Laura Kelly. "We help manufacture the aircraft the world relies on. Boeing's acquisition of Spirit AeroSystems underscores the global significance of the work happening in our state and positions Kansas to continue shaping the future of aerospace innovation for decades to come."

"Wichita would not be the Air Capital of the World without the extraordinary engineers, designers and manufacturers who have invested in our aerospace industry and made Kansas their home," said U.S. Senator Jerry Moran. "Boeing's acquisition of Spirit AeroSystems will help build bridges between Seattle and Wichita and bring new opportunities to the Air Capital of the World. I welcome Boeing back to Wichita and look forward to working with them to build a lasting relationship with the community and its workforce, as well as current and future suppliers, to continue building on the growth we have seen in recent years."

![](tm2532915d1_ex99-1img001.jpg)

"Today's announcement is a great recognition of the world-class talent we have in Wichita," said U.S. Senator Roger Marshall. "Our workers and the unions that represent them have kept America as the gold standard in aerospace, and they deserve to be at the center of any future investment. I'm grateful that this agreement further solidifies Wichita's prestige in the industry."

"Kansas has a rich aviation history, and our region continues to lead the way in designing, developing and manufacturing world-class aircraft that serve the world," said U.S. Congressman Ron Estes. "Boeing's acquisition of Spirit AeroSystems continues to build on the successes of a century of U.S. flight. As the flags change at the manufacturing facility in southeast Wichita, I will remain a steadfast advocate for the skilled workforce and communities that make up the Air Capital of the World."

\# \# \#

**About Boeing**

A leading global aerospace company and top U.S. exporter, Boeing develops, manufactures and services commercial airplanes, defense products and space systems for customers in more than 150 countries. Our U.S. and global workforce and supplier base drive innovation, economic opportunity, sustainability and community impact. Boeing is committed to fostering a culture based on our core values of safety, quality and integrity.

**Cautionary Statement Regarding Forward-Looking Statements**

Certain statements in this release constitute "forward-looking statements" within the meaning of the Private Securities Litigation Reform Act of 1995. Examples of forward-looking statements include statements relating to the anticipated benefits and synergies of the acquisition, Spirit's future operations, and the impact of the acquisition on our business and future financial condition and operating results, as well as any other statement that does not directly relate to any historical or current fact. Forward-looking statements are based on current assumptions about future events that may not prove to be accurate. These statements are not guarantees and are subject to risks, uncertainties and changes in circumstances that are difficult to predict. Many factors could cause actual results to differ materially from these forward-looking statements. As a result, these statements speak only as of the date they are made and we undertake no obligation to update or revise any forward-looking statement, except as required by law. Specific factors that could cause actual results to differ materially from these forward-looking statements include the effect of global economic conditions, our ability to successfully integrate Spirit's business and realize anticipated synergies, and other important factors disclosed previously and from time to time in our reports filed with the Securities and Exchange Commission.

Boeing Media Relations

<u>media@boeing.com</u>

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