Document:

<PAGE>

                                                                   Exhibit 10.18

                                 AMENDMENT NO. 1
                                       TO
                      AMENDED AND RESTATED CREDIT AGREEMENT

          This AMENDMENT NO. 1, dated as of December 11, 2005 (this
"Amendment"), amends the AMENDED AND RESTATED CREDIT AGREEMENT, dated as of July
20, 2005 (as amended, amended and restated, supplemented or otherwise modified
from time to time, the "Credit Agreement"), among SPIRIT AEROSYSTEMS, INC.(f/k/a
MID-WESTERN AIRCRAFT SYSTEMS, INC.), a Delaware corporation (the "U.S.
Borrower"); SPIRIT AEROSYSTEMS HOLDINGS, INC. (f/k/a MID-WESTERN AIRCRAFT
SYSTEMS HOLDINGS, INC.), a Delaware corporation (the "Parent Guarantor"); ONEX
WIND FINANCE LP, a Delaware limited partnership (the "Additional Borrower"); the
financial institutions listed on Schedule 2.01 thereto, as such Schedule may
from time to time be supplemented and amended (the "Lenders"); CITICORP NORTH
AMERICA, INC. ("CNAI"), as administrative agent (in such capacity, the
"Administrative Agent") for the Lenders, and as collateral agent (in such
capacity, the "Collateral Agent"); CITIGROUP GLOBAL MARKETS INC. ("CGMI"), as
sole lead arranger and bookrunner (in such capacity, the "Lead Arranger"); THE
BANK OF NOVA SCOTIA and ROYAL BANK OF CANADA, as co-arrangers (the
"Co-Arrangers") and as co-syndication agents (the "Co-Syndication Agents"); THE
BANK OF NOVA SCOTIA, as Issuing Bank; and EXPORT DEVELOPMENT CANADA and CAISSE
DE DEPOT ET PLACEMENT DU QUEBEC, as co-documentation agents (the
"Co-Documentation Agents"). Capitalized terms used herein and not otherwise
defined herein shall have the meanings ascribed to them in the Credit Agreement.
Capitalized terms defined herein shall be deemed to be defined in the Credit
Agreement for all purposes.

                                   WITNESSETH:

          WHEREAS, Borrowers have requested that the Lenders amend the Credit
Agreement to effect the changes described below;

          WHEREAS, Section 10.08 of the Credit Agreement permits the Credit
Agreement to be amended from time to time;

          WHEREAS, Borrowers have requested that the Lenders consent to this
Amendment for the purpose of (i) permitting certain Liens on property to secure
Permitted IRB Lease Obligations and (ii) permitting certain transfers of
property in connection with the incurrence of Permitted IRB Lease Obligations.

          NOW, THEREFORE, in consideration of the premises and for other good
and valuable consideration (the receipt and sufficiency of which hereby
acknowledged), the parties hereto hereby agree as follows:

          SECTION ONE Amendments. The Credit Agreement is, effective as of the
Amendment Effective Date (as defined below), hereby amended as follows:

<PAGE>

          (a) Section 6.02 of the Credit Agreement is hereby amended by deleting
     the word "and" at the end of clause (xxii) thereof, inserting the word
     "and" at the end of clause (xxiii) thereof, and inserting the following
     provision immediately after such clause (xxiii):

               "(xxiv) Liens to secure Permitted IRB Lease Obligations covering
          only the property leased from a City in connection with such Permitted
          IRB Lease Obligations;"

          (b) Section 6.05 of the Credit Agreement is hereby amended by deleting
     the word "and" at the end of clause (xiii) thereof, inserting the word
     "and" at the end of clause (xiv) thereof, and inserting the following
     provision immediately after such clause (xiv):

               "(xv) sales, transfers and/or other dispositions of property by
          one or more Loan Parties to a City (as described in the definition of
          Permitted IRB Lease Obligations) in connection with the incurrence of
          Permitted IRB Lease Obligations;"

          SECTION TWO Conditions to Effectiveness. This Amendment shall become
effective on and as of the first date (the "Amendment Effective Date") on which
all of the following conditions precedent shall have been satisfied in full:

          (a) The Administrative Agent shall have received (i) counterparts of
     this Amendment executed by each of the Borrowers and the Parent Guarantor
     and (ii) executed Amendment Addenda (in the form attached hereto as Exhibit
     A) from a number of Lenders sufficient to constitute the Requisite Lenders.

          (b) The representations and warranties set forth in Article III of the
     Credit Agreement and in the other Loan Documents shall be on and as of the
     Amendment Effective Date true and correct in all material respects (except
     that any representation or warranty that is qualified as to "materiality"
     or "Material Adverse Effect" shall be true and correct in all respects)
     with the same effect as if then made (unless expressly stated to relate to
     an earlier date, in which case such representations and warranties shall be
     true and correct in all material respects (except that any representation
     or warranty that is qualified as to "materiality" or "Material Adverse
     Effect" shall be true and correct in all respects) as of such earlier
     date).

          (c) As of the Amendment Effective Date, no Default or Event of Default
     shall have occurred and be continuing.

          (d) All reasonable out-of-pocket expenses to the extent invoiced prior
     to the Amendment Effective Date (including reasonable fees, charges and
     disbursements of Cahill Gordon & Reindel LLP) of the Agents in connection
     with this Amendment shall have been reimbursed or paid by the Borrowers.

          SECTION THREE Representations and Warranties; Covenants. In order to
induce the Requisite Lenders to enter into this Amendment, the Borrowers and the
Parent

                                       2

<PAGE>

Guarantor jointly and severally represent and warrant to each of the Lenders
that both before and after giving effect to this Amendment: (a) no Default or
Event of Default has occurred and is continuing and (b) all of the
representations and warranties set forth in Article III of the Credit Agreement
and in the other Loan Documents are true and correct in all material respects
(except that any representation and warranty that is qualified as to
"materiality" or "Material Adverse Effect" is true and correct in all respects)
on and as of the date hereof as if made on the date hereof (or, if any such
representation or warranty is expressly stated to have been made as of a
specific date, as of such specific date).

          SECTION FOUR Reference to and Effect on the Credit Agreement. Other
than as specifically provided in this Amendment, this Amendment shall not
operate as a waiver or amendment of any right, power or privilege of the Lenders
or the Secured Parties under the Credit Agreement or any other Loan Document or
of any other term or condition of the Credit Agreement or any other Loan
Document, nor shall the entering into of this Amendment preclude the Lenders
from refusing to enter into any further waivers or amendments with respect to
the Credit Agreement or any other Loan Document. All references to the Credit
Agreement in any document, instrument, agreement, or writing shall from and
after the Amendment Effective Date be deemed to refer to the Credit Agreement as
amended by this Amendment and references in the Credit Agreement to "this
Agreement," "hereunder," "herein," or words of like import shall mean and be a
reference to the Credit Agreement, as affected and amended hereby.

          SECTION FIVE Acknowledgements. Each of the Loan Parties hereby (i)
expressly acknowledges the terms of this Amendment, (ii) ratifies and affirms
its obligations under the Loan Documents to which it is a party (including
without limitation the Guarantee Agreement and Security Documents and Liens and
security interests granted thereunder) and (iii) acknowledges its continued
liability under each Loan Document to which it is a party and agrees that such
Loan Documents remain in full force and effect, including with respect to the
Obligations.

          SECTION SIX Amendment Addenda; Execution in Counterparts. Each Lender
to become a party to this Amendment shall do so by delivering to the
Administrative Agent an Amendment Addendum in the form attached hereto as
Exhibit A (each, an "Amendment Addendum") duly executed by such Lender and the
Administrative Agent. References in this Amendment to "this Amendment,"
"hereunder," "herein," or words of like import shall mean and be a reference to
this Amendment and each such executed Lender Addendum.

          This Amendment may be executed in any number of counterparts and by
different parties hereto in separate counterparts, each of which when so
executed shall be deemed to be an original and all of which taken together shall
constitute but one and the same agreement. Delivery of an executed counterpart
of a signature page to this Amendment by telecopier shall be effective as
delivery of a manually executed counterpart of this Amendment.

          SECTION SEVEN Governing Law. THIS AMENDMENT SHALL BE CONSTRUED IN
ACCORDANCE WITH, AND GOVERNED BY THE LAW OF THE STATE OF NEW YORK.

                                       3

<PAGE>

          SECTION EIGHT Headings. The various headings used herein are for
convenience of reference only, are not part of this Amendment and are not to
affect the construction of, or to be taken into consideration in interpreting,
this Amendment.

                            [Signature Pages Follow]

                                       4

<PAGE>

          IN WITNESS THEREOF, the parties hereto have caused this Amendment to
be duly executed by their duly authorized officers as of the day and year first
above written.

                                        SPIRIT AEROSYSTEMS, INC. (f/k/a
                                        MID-WESTERN AIRCRAFT SYSTEMS, INC.),
                                        as U.S. Borrower

                                        By: /s/ Mike L. Williams
                                            ------------------------------------
                                        Name: Mike L. Williams
                                        Title: Sr. Vice President - Finance

                                        SPIRIT AEROSYSTEMS HOLDINGS, INC. (f/k/a
                                        MID-WESTERN AIRCRAFT SYSTEMS HOLDINGS,
                                        INC.),
                                        as Parent Guarantor

                                        By: /s/ Seth Mersky
                                            ------------------------------------
                                        Name:
                                              ----------------------------------
                                        Title:
                                               ---------------------------------

                                        ONEX WIND FINANCE LP,
                                        as Additional Borrower

                                        By: 1648701 Ontario Inc., its General
                                            Partner

                                        By: /s/ Donald F. West
                                            ------------------------------------
                                        Name: Donald F. West
                                        Title: Representative

                                        CITICORP NORTH AMERICA, INC.,
                                        as Administrative Agent

                                        By: /s/ Hector Guenther
                                            ------------------------------------
                                        Name: Hector Guenther
                                        Title: Vice president

<PAGE>

                                                                       EXHIBIT A

                                    [Form of]
                               AMENDMENT ADDENDUM

          Reference is made to AMENDMENT NO. 1 TO THE AMENDED AND RESTATED
CREDIT AGREEMENT dated as of December [___], 2005 (the "Amendment"), amending
the AMENDED AND RESTATED CREDIT AGREEMENT, dated as of July 20, 2005 (as
amended, amended and restated, supplemented or otherwise modified from time to
time, the "Credit Agreement"), among SPIRIT AEROSYSTEMS, INC. (f/k/a MID-WESTERN
AIRCRAFT SYSTEMS, INC.), a Delaware corporation (the "U.S. Borrower"); SPIRIT
AEROSYSTEMS HOLDINGS, INC. (f/k/a MID-WESTERN AIRCRAFT SYSTEMS HOLDINGS, INC.),
a Delaware corporation (the "Parent Guarantor"); ONEX WIND FINANCE LP, a
Delaware limited partnership (the "Additional Borrower"); the financial
institutions listed on Schedule 2.01 thereto, as such Schedule may from time to
time be supplemented and amended (the "Lenders"); CITICORP NORTH AMERICA, INC.
("CNAI"), as administrative agent (in such capacity, the "Administrative Agent")
for the Lenders, and as collateral agent (in such capacity, the "Collateral
Agent"); CITIGROUP GLOBAL MARKETS INC. ("CGMI"), as sole lead arranger and
bookrunner (in such capacity, the "Lead Arranger"); THE BANK OF NOVA SCOTIA and
ROYAL BANK OF CANADA, as co-arrangers (the "Co-Arrangers") and as co-syndication
agents (the "Co-Syndication Agents"); THE BANK OF NOVA SCOTIA, as Issuing Bank;
and EXPORT DEVELOPMENT CANADA and CAISSE DE DEPOT ET PLACEMENT DU QUEBEC, as
co-documentation agents (the "Co-Documentation Agents").

          Upon execution and delivery of this Amendment Addendum by the parties
hereto and upon receipt of executed Amendment Addenda from the Requisite Lenders
as provided in Section 10.08 of the Credit Agreement, the undersigned hereby
becomes a party to the Amendment, effective as of the date hereof.

          THIS AMENDMENT ADDENDUM SHALL BE CONSTRUED IN ACCORDANCE WITH, AND
GOVERNED BY THE LAW OF THE STATE OF NEW YORK.

          This Amendment Addendum may be executed by one or more of the parties
hereto on any number of separate counterparts, and all of said counterparts
taken together shall be deemed to constitute one and the same instrument.
Delivery of an executed signature page hereof by facsimile transmission shall be
effective as delivery of a manually executed counterpart hereof.

<PAGE>

          IN WITNESS WHEREOF, the parties hereto have caused this Amendment
Addendum to be duly executed and delivered by their proper and duly authorized
officers as of the date of the Amendment first set forth above.

                                        [                                     ],
                                         -------------------------------------
                                        as a Lender

                                        By:
                                            ------------------------------------
                                        Name:
                                              ----------------------------------
                                        Title:
                                               ---------------------------------

                                        [If second signature is necessary:]

                                        By:
                                            ------------------------------------
                                        Name:
                                              ----------------------------------
                                        Title:
                                               ---------------------------------<PAGE>

                                                                   Exhibit 10.19

                                 AMENDMENT NO. 2
                                       TO
                      AMENDED AND RESTATED CREDIT AGREEMENT

          This AMENDMENT NO. 2, dated as of March 31, 2006 (this "Amendment"),
amends the AMENDED AND RESTATED CREDIT AGREEMENT, dated as of July 20, 2005 (as
amended, amended and restated, supplemented or otherwise modified from time to
time, the "Credit Agreement"), among SPIRIT AEROSYSTEMS, INC. (f/k/a MID-WESTERN
AIRCRAFT SYSTEMS, INC.), a Delaware corporation (the "U.S. Borrower"); SPIRIT
AEROSYSTEMS HOLDINGS, INC. (f/k/a MID-WESTERN AIRCRAFT SYSTEMS HOLDINGS, INC.),
a Delaware corporation (the "Parent Guarantor"); ONEX WIND FINANCE LP, a
Delaware limited partnership (the "Additional Borrower"); the financial
institutions listed on Schedule 2.01 thereto, as such Schedule may from time to
time be supplemented and amended (the "Lenders"); CITICORP NORTH AMERICA, INC.
("CNAI"), as administrative agent (in such capacity, the "Administrative Agent")
for the Lenders, and as collateral agent (in such capacity, the "Collateral
Agent"); CITIGROUP GLOBAL MARKETS INC. ("CGMI"), as sole lead arranger and
bookrunner (in such capacity, the "Lead Arranger"); THE BANK OF NOVA SCOTIA and
ROYAL BANK OF CANADA, as co-arrangers (the "Co-Arrangers") and as co-syndication
agents (the "Co-Syndication Agents"); THE BANK OF NOVA SCOTIA, as Issuing Bank;
and EXPORT DEVELOPMENT CANADA and CAISSE DE DEPOT ET PLACEMENT DU QUEBEC, as
co-documentation agents (the "Co-Documentation Agents"). Capitalized terms used
herein and not otherwise defined herein shall have the meanings ascribed to them
in the Credit Agreement. Capitalized terms defined herein shall be deemed to be
defined in the Credit Agreement for all purposes.

                                   WITNESSETH:

          WHEREAS, Borrowers have requested that the Lenders amend the Credit
Agreement to effect the changes described below;

          WHEREAS, Section 10.08 of the Credit Agreement permits the Credit
Agreement to be amended from time to time;

          WHEREAS, Borrowers have requested that the Lenders consent to this
Amendment for the purposes set forth in this Amendment.

          NOW, THEREFORE, in consideration of the premises and for other good
and valuable consideration (the receipt and sufficiency of which hereby
acknowledged), the parties hereto hereby agree as follows:

          SECTION ONE Amendments. The Credit Agreement is, effective as of the
Amendment Effective Date (as defined below), hereby amended as follows:

<PAGE>

          (a) Section 1.01 of the Credit Agreement is hereby amended by
     inserting the following prevision at the end of the definition of
     "Commitment":

          ", and any Commitment to make Revolving Loans extended by such Lender
          as provided in Section 2.21"

          (b) Section 1.01 of the Credit Agreement is hereby amended by deleting
     the term "and" at the end of clause (j) of the definition of "Consolidated
     EBITDA" and inserting the following new clause (1) immediately after clause
     (k):

          "(1) costs and expenses incurred in connection with the U.K.
          Acquisition paid or invoiced on or before December 31, 2006 (not to
          exceed $6.0 million); and"

          (c) Section 1.01 of the Credit Agreement is hereby amended by
     inserting the following provision at the end of the definition of
     "Revolving Loans":

          "(and shall include any Loans contemplated by Section 2.21)"

          (d) Section 1.01 of the Credit Agreement is hereby amended by
     inserting the term "and any Subsidiaries of the U.S. Borrower" immediately
     after the term "the other Loan Parties" and deleting the term "relating to
     any Loans", in each case in clause (c) of the definition of "Obligations,"
     and adding the term "or in respect of overdrafts and related liabilities
     owed to any Qualified Counterparty, arising from treasury, depositary and
     cash management services or in connection with any automated clearinghouse
     or Bank Automated Clearing System transfer of funds" at the end of such
     clause.

          (e) Section 1.01 of the Credit Agreement is hereby amended by deleting
     the tern "relating to any Loans" and inserting the term "or other
     obligation described in clause (c) of the definition of `Obligations'"
     after each occurrence of the term "Hedging Agreement", in each case in the
     definition of "Qualified Counterparty."

          (f) Section 1.01 of the Credit Agreement is hereby amended by
     inserting the following provision in the definition of "Revolving Credit
     Commitment" immediately following the term "Swingline Loans hereunder":

          "(including without limitation by virtue of an Increase Joinder)"

          (g) Section 1.01 of the Credit Agreement is hereby amended by adding
     the following definitions in alphabetical order:

          "Increase Effective Date" shall have the meaning assigned to such term
          in Section 2.21(a).

          "Increase Joinder" shall have the meaning assigned to such term in
          Section 2.21(c).

          "Post-Increase Revolving Lenders" shall have the meaning assigned to
          such term in Section 2.21(d).

                                       2

<PAGE>

          "Pre-Increase Revolving Lenders" shall have the meaning assigned to
          such term in Section 2.21(d).

          "U.K. Acquisition" shall mean the acquisition by the U.K. Subsidiary
          of the Aerostructures business of BAE Systems plc for an aggregate
          purchase price not to exceed (pound)80,000,000 plus the amount of any
          working capital adjustment payable pursuant to the acquisition
          documentation relating thereto and any normal utility and property tax
          adjustments associated with the purchase of real property.

          "U.K. Subsidiary" shall mean Spirit Aerosystems (Europe) Limited, a
          corporation organized under the laws of the United Kingdom.

          (h) Section 2.01(a) of the Credit Agreement is hereby amended by
     deleting the term "(B) the Aggregate Revolving Credit Exposure would exceed
     $50.0 million prior to the time that at least $50.0 million has been
     borrowed under the Seller Loan Agreement" and replacing it with the
     following:

          "(B) the aggregate Available Revolving Credit Commitment is less than
          $50.0 million prior to the time that at least $50.0 million has been
          borrowed under the Seller Loan Agreement"

          (i) Section 2.06(b) of the Credit Agreement is hereby amended by
     deleting the term "(iii) prior to the time that at least $50.0 million has
     been borrowed under the Seller Loan Agreement, the Aggregate Revolving
     Credit Exposure shall not exceed $50.0 million" and replacing it with the
     following:

          "(iii) prior to the time that at least $50.0 million has been borrowed
          under the Seller Loan Agreement, the Available Revolving Credit
          Commitment shall not be less than $50.0 million"

          (j) Section 2.21 shall be inserted immediately after Section 2.20 of
     the Credit Agreement as follows:

               (a) Borrower Request. U.S. Borrower may by written notice to the
          Administrative Agent elect to request prior to the Revolving Credit
          Maturity Date, an increase to the existing Revolving Credit Commitment
          by an amount not in excess of $75,000,000 in the aggregate. Each such
          notice shall specify (i) the date (each, an "Increase Effective Date")
          on which U.S. Borrower proposes that the increased Revolving Credit
          Commitment shall be effective, which shall be a date not less than 10
          Business Days after the date on which such notice is delivered to the
          Administrative Agent and (ii) the identity of each Eligible Assignee
          to whom U.S. Borrower proposes any portion of such increased Revolving
          Credit Commitment be allocated and the amounts of such allocations;
          provided that any existing Lender approached to provide all or a
          portion of the increased Revolving Credit Commitment may elect or
          decline, in its sole discretion, to provide such increased Revolving
          Credit Commitment.

                                       3

<PAGE>

               (b) Conditions. The increased Revolving Credit Commitment shall
          become effective, as of such Increase Effective Date; provided that:

                    (1) each of the conditions set forth in Section 4.02 shall
               be satisfied;

                    (2) no Default shall have occurred and be continuing or
               would result from the borrowings made on the Increase Effective
               Date, if any;

                    (3) U.S. Borrower shall deliver or cause to be delivered any
               legal opinions or other documents reasonably requested by the
               Administrative Agent in connection with any such transaction; and

                    (4) U.S. Borrower shall deliver mortgage amendments
               sufficient to cover the full amount of the increase of the
               Revolving Credit Commitments, pursuant to documentation
               reasonably satisfactory to the Agents.

               (c) Terms of New Loans and Commitments. The terms and provisions
          of Revolving Loans made pursuant to increased Revolving Credit
          Commitments shall be identical to the Revolving Loans.

               The increased Revolving Credit Commitments shall be effected by a
          joinder agreement (the "Increase Joinder") executed by U.S. Borrower,
          the Administrative Agent and each Lender making such increased
          Revolving Credit Commitment, in form and substance satisfactory to
          each of them. The Increase Joinder may, without the consent of any
          other Lenders, effect such amendments to this Agreement and the other
          Loan Documents as may be necessary or appropriate, in the opinion of
          the Administrative Agent, to effect the provisions of this Section
          2.21. In addition, unless otherwise specifically provided herein, all
          references in Loan Documents to Revolving Loans shall be deemed,
          unless the context otherwise requires, to include references to
          Revolving Loans made pursuant to increased Revolving Credit
          Commitments made pursuant to this Agreement.

               (d) Adjustment of Revolving Loans. Each of the Revolving Lenders
          having a Revolving Commitment prior to such Increase Effective Date
          (the "Pre-Increase Revolving Lenders") shall assign to any Revolving
          Lender which is acquiring a new or additional Revolving Commitment on
          the Increase Effective Date (the "Post-Increase Revolving Lenders"),
          and such Post-Increase Revolving Lenders shall purchase from each
          Pre-Increase Revolving Lender, at the principal amount thereof, such
          interests in the Revolving Loans and participation interests in LC
          Exposure and Swingline Loans outstanding on such Increase Effective
          Date as shall be necessary in order that, after giving effect to all
          such assignments and purchases, such Revolving Loans and participation
          interests in LC Exposure and Swingline Loans will be held by
          Pre-Increase Revolving Lenders and

                                       4

<PAGE>

          Post-Increase Revolving Lenders ratably in accordance with their
          Revolving Commitments after giving effect to such increased Revolving
          Commitments.

               (e) Equal and Ratable Benefit. The Revolving Credit Commitment
          established pursuant to this paragraph shall constitute Revolving
          Credit Commitments under, and shall be entitled to all the benefits
          afforded by, this Agreement and the other Loan Documents, and shall,
          without limiting the foregoing, benefit equally and ratably from the
          Guarantees and security interests created by the Security Documents.
          The Loan Parties shall take any actions reasonably required by the
          Administrative Agent to ensure and/or demonstrate that the Lien and
          security interests granted by the Security Documents continue to be
          perfected under the UCC or otherwise after giving effect to the
          establishment of any such increased Revolving Credit Commitment.

          (k) Section 6.03(d) of the Credit Agreement is hereby amended by
     adding the following provision at the end of such clause immediately after
     the term "Section 6.04(x)":

               "or (xvi)".

          (l) Section 6.04 of the Credit Agreement is hereby amended by deleting
     the word "and" at the end of clause (xiv) and replacing "." at the end of
     clause (xv) with "; and", and inserting new clause (xvi) immediately
     thereafter as follows:

               "(xvi) the consummation of the U.K. Acquisition on or prior to
          April 30, 2006."

          (m) Section 10.08(c)(ix) of the Credit Agreement is hereby amended by
     adding the following provision immediately after the term "this Agreement":

               "pursuant to Section 2.21 or"

          The Security Agreement is, effective as of the Amendment Effective
Date (as defined below), hereby amended as follows:

               (a) Recital D of the Security Agreement is hereby amended by
          deleting the term "relating to Loans."

          SECTION TWO Consent. Pursuant to Section 10.3 of Subordination and
Intercreditor Agreement, the Lenders party hereto hereby consent to the
Collateral Agent's execution of an amendment to the Subordination and
Intercreditor Agreement to conform the definition of "Senior Obligations"
therein to the amendment to the definition of "Obligations" and to conform the
definition of "Qualified Counterparty" therein to the amendment to the
definition of the same term, in each case pursuant to Section I of this
Amendment.

          SECTION THREE Conditions to Effectiveness. This Amendment shall become
effective on and as of the first date (the "Amendment Effective Date") on which
all of the following conditions precedent shall have been satisfied in full:

                                       5

<PAGE>

          (a) The Administrative Agent shall have received (i) counterparts of
     this Amendment executed by each of the Borrowers and the Parent Guarantor
     and (ii) executed Amendment Addenda (in the form attached hereto as Exhibit
     A) from a number of Lenders sufficient to constitute the Requisite Lenders;
     provided that Section 1(d) and Section 2 of this Amendment shall not be
     effective until the Administrative Agent shall have received executed
     Amendment Addenda from a number of Lenders sufficient to constitute the
     Supermajority Senior Lenders (as defined in the Subordination and
     Intercreditor Agreement) and the requisite Subordinated Lenders under the
     Subordination and Intercreditor Agreement.

          (b) The representations and warranties set forth in Article III of the
     Credit Agreement and in the other Loan Documents shall be on and as of the
     Amendment Effective Date true and correct in all material respects (except
     that any representation or warranty that is qualified as to "materiality"
     or "Material Adverse Effect" shall be true and correct in all respects)
     with the same effect as if then made (unless expressly stated to relate to
     an earlier date, in which case such representations and warranties shall be
     true and correct in all material respects (except that any representation
     or warranty that is qualified as to "materiality" or "Material Adverse
     Effect" shall be true and correct in all respects) as of such earlier
     date).

          (c) As of the Amendment Effective Date, no Default or Event of Default
     shall have occurred and be continuing.

          SECTION FOUR Representations and Warranties; Covenants. In order to
induce the Requisite Lenders to enter into this Amendment, the Borrowers and the
Parent Guarantor jointly and severally represent and warrant to each of the
Lenders that both before and after giving effect to this Amendment: (a) no
Default or Event of Default has occurred and is continuing, (b) all of the
representations and warranties set forth in Article III of the Credit Agreement
and in the other Loan Documents are true and correct in all material respects
(except that any representation and warranty that is qualified as to
"materiality" or "Material Adverse Effect" is true and correct in all respects)
on and as of the date hereof as if made on the date hereof (or, if any such
representation or warranty is expressly stated to have been made as of a
specific date, as of such specific date) and (c) all reasonable out-of-pocket
expenses (including reasonable fees, charges and disbursements of Cahill Gordon
& Reindel LLP) of the Agents in connection with this Amendment, to the extent
invoiced, will be promptly reimbursed or paid by the Borrowers.

          SECTION FIVE Reference to and Effect on the Credit Agreement. Other
than as specifically provided in thus Amendment, this Amendment shall not
operate as a waiver or amendment of any right, power or privilege of the Lenders
or the Secured Parties under the Credit Agreement or any other Loan Document or
of any other term or condition of the Credit Agreement or any other Loan
Document, nor shall the entering into of this Amendment preclude the Lenders
from refusing to enter into any further waivers or amendments with respect to
the Credit Agreement or any other Loan Document. All references to the Credit
Agreement in any document, instrument, agreement, or writing shall from and
after the Amendment Effective Date be deemed to refer to the Credit Agreement as
amended by this Amendment and references in

                                       6

<PAGE>

the Credit Agreement to "this Agreement," "hereunder," "herein," or words of
like import shall mean and be a reference to the Credit Agreement, as affected
and amended hereby.

          SECTION SIX Acknowledgements. Each of the Loan Parties hereby (i)
expressly acknowledges the terms of this Amendment, (ii) ratifies and affirms
its obligations under the Loan Documents to which it is a party (including
without limitation the Guarantee Agreement and Security Documents and Liens and
security interests granted thereunder) and (iii) acknowledges its continued
liability under each Loan Document to which it is a party and agrees that such
Loan Documents remain in full force and effect, including with respect to the
Obligations.

          SECTION SEVEN Amendment Addenda; Execution in Counterparts. Each
Lender to become a party to this Amendment shall do so by delivering to the
Administrative Agent an Amendment Addendum in the form attached hereto as
Exhibit A (each, an "Amendment Addendum") duly executed by such Lender and the
Administrative Agent. References in this Amendment to "this Amendment,"
"hereunder," "herein," or words of like import shall mean and be a reference to
this Amendment and each such executed Lender Addendum.

          This Amendment may be executed in any number of counterparts and by
different parties hereto in separate counterparts, each of which when so
executed shall be deemed to be an original and all of which taken together shall
constitute but one and the same agreement. Delivery of an executed counterpart
of a signature page to this Amendment by telecopier shall be effective as
delivery of a manually executed counterpart of this Amendment.

          SECTION EIGHT Governing Law. THIS AMENDMENT SHALL BE CONSTRUED IN
ACCORDANCE WITH, AND GOVERNED BY THE LAW OF THE STATE OF NEW YORK.

          SECTION NINE Headings. The various headings used herein are for
convenience of reference only, are not part of this Amendment and are not to
affect the construction of, or to be taken into consideration in interpreting,
this Amendment.

                            [Signature Pages Follow]

                                       7

<PAGE>

          IN WITNESS THEREOF, the parties hereto have caused this Amendment to
be duly executed by their duly authorized officers as of the day and year first
above written.

                                        SPIRIT AEROSYSTEMS, INC. (f/k/a
                                        MID-WESTERN AIRCRAFT SYSTEMS, INC.), as
                                        U.S. Borrower

                                        By: /s/ Ulrich Schmidt
                                            ------------------------------------
                                        Name: Ulrich Schmidt
                                        Title: Executive Vice President and
                                               Chief Financial Officer

                                        SPIRIT AEROSYSTEMS HOLDINGS, INC. (f/k/a
                                        MID-WESTERN AIRCRAFT SYSTEMS HOLDINGS,
                                        INC.),
                                        as Parent Guarantor

                                        By: /s/ Nigel Wright
                                            ------------------------------------
                                        Name:
                                              ----------------------------------
                                        Title:
                                               ---------------------------------

                                        ONEX WIND FINANCE LP, as Additional
                                        Borrower

                                        By: 1648701 Ontario Inc., its General
                                            Partner

                                        By: /s/  Nigel Wright
                                            ------------------------------------
                                        Name:
                                              ----------------------------------
                                        Title:
                                               ---------------------------------

<PAGE>

          IN WITNESS WHEREOF, the parties hereto have executed this Amendment as
of the date first written above.

                                        CITICORP NORTH AMERICA, INC., as Senior
                                        Administrative Agent and Senior
                                        Collateral Agent

                                        By: /s/ Hector Guenther
                                            ------------------------------------
                                        Name: Hector Guenther
                                        Title: Vice President

                                        Address:
                                        390 Greenwich Street
                                        New York, New York 10013
                                        Attention: Sandra Munoz
                                        Telecopy (212) 994-0961
                                        E-mail: sandra.m.mumoz@citigroup.com

<PAGE>

                                                                       EXHIBIT A

                                    [Form of]
                               AMENDMENT ADDENDUM

          Reference is made to AMENDMENT NO. 2 TO THE AMENDED AND RESTATED
CREDIT AGREEMENT dated as of March 31, 2006 (the "Amendment"), amending the
AMENDED AND RESTATED CREDIT AGREEMENT, dated as of July 20, 2005 (as amended,
amended and restated, supplemented or otherwise modified from time to time, the
"Credit Agreement"), among SPIRIT AEROSYSTEMS, INC. (f/k/a MID-WESTERN AIRCRAFT
SYSTEMS, INC.), a Delaware corporation (the "U.S. Borrower"); SPIRIT AEROSYSTEMS
HOLDINGS, INC. (f/k/a MID-WESTERN AIRCRAFT SYSTEMS HOLDINGS, INC.), a Delaware
corporation (the "Parent Guarantor"); ONEX WIND FINANCE LP, a Delaware limited
partnership (the "Additional Borrower"); the financial institutions listed on
Schedule 2.01 thereto, as such Schedule may from time to time be supplemented
and amended (the "Lenders"); CITICORP NORTH AMERICA, INC. ("CNAI"), as
administrative agent (in such capacity, the "Administrative Agent") for the
Lenders, and as collateral agent (in such capacity, the "Collateral Agent");
CITIGROUP GLOBAL MARKETS INC. ("CGMI"), as sole lead arranger and bookrunner (in
such capacity, the "Lead Arranger"); THE BANK OF NOVA SCOTIA and ROYAL BANK OF
CANADA, as co-arrangers (the "Co-Arrangers") and as co-syndication agents (the
"Co-Syndication Agents"); THE BANK OF NOVA SCOTIA, as Issuing Bank; and EXPORT
DEVELOPMENT CANADA and CAISSE DE DEPOT ET PLACEMENT DU QUEBEC, as
co-documentation agents (the "Co-Documentation Agents")

          Upon execution and delivery of this Amendment Addendum by the parties
hereto and upon receipt of executed Amendment Addenda from the Requisite Lenders
as provided in Section 10.08 of the Credit Agreement, the undersigned hereby
becomes a party to the Amendment, effective as of the date hereof.

          THIS AMENDMENT ADDENDUM SHALL BE CONSTRUED IN ACCORDANCE WITH, AND
GOVERNED BY THE LAW OF THE STATE OF NEW YORK.

          This Amendment Addendum may be executed by one or more of the parties
hereto on any number of separate counterparts, and all of said counterparts
taken together shall be deemed to constitute one and the same instrument.
Delivery of an executed signature page hereof by facsimile transmission shall be
effective as delivery of a manually executed counterpart hereof.

<PAGE>

          IN WITNESS WHEREOF, the parties hereto have caused this Amendment
Addendum to be duly executed and delivered by their proper and duly authorized
officers as of the date of the Amendment first set forth above.

                                        [                                     ],
                                         -------------------------------------
                                        as a Lender

                                        By:
                                            ------------------------------------
                                        Name:
                                              ----------------------------------
                                        Title:
                                               ---------------------------------

                                        [If second signature is necessary:]

                                        By:
                                            ------------------------------------
                                        Name:
                                              ----------------------------------
                                        Title:
                                               ---------------------------------

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