Company: SPR
Filing Date: 2025-12-08
Form Type: POSASR
Source: 0001104659-25-119097
Chunk: 0

Company: Spirit AeroSystems Holdings, Inc.
Filing Date: 2025-12-08
Form: POSASR
Chunk 0
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<div align='center'>As filed with the Securities and Exchange Commission on December 8, 2025</div>

Registration No. 333-275362

<div align='center'>UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

Post-Effective Amendment No. 1 to

FORM S-3

REGISTRATION STATEMENT

UNDER

THE SECURITIES ACT OF 1933

Spirit AeroSystems Holdings, Inc.

(Exact name of registrant as specified in its
charter)</div>

| Delaware                                                | 20-2436320                  |
| (State                                                  
 or other jurisdiction of incorporation or organization) | -I.R.S.                     
 Employer Identification No. |

<div align='center'>3801 South Oliver

Wichita, Kansas 67210

(316) 526-9000

(Address, including zip code, and telephone number,
including area code, of registrant’s principal executive offices)

David Myers

Vice President, General Counsel and Corporate Secretary

Spirit AeroSystems Holdings, Inc.

3801 South Oliver

Wichita, Kansas 67210

(316) 526-9000

(Name, address, including zip code, and telephone
number, including area code, of agent for service)

With copies to:

John C. Demers

Vice President, Assistant General Counsel and Corporate Secretary

The Boeing Company

929 Long Bridge Drive, Arlington, VA 22202

(703) 465-3500

Approximate date of commencement of proposed sale
to the public: Not applicable.</div>

If the only securities being registered on this Form are being offered pursuant to dividend or interest reinvestment plans, please check the following box.¨

If any of the securities being registered on this Form are to be offered on a delayed or continuous basis pursuant to Rule 415 under the Securities Act of 1933, other than securities offered only in connection with dividend or interest reinvestment plans, check the following box.¨

If this Form is filed to register additional securities for an offering pursuant to Rule 462(b) under the Securities Act, please check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering.¨

If this Form is a post-effective amendment filed pursuant to Rule 462(c) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering.¨

If this