Document:

Third Supplemental Indenture

 Exhibit 4.3 
 BRISTOW GROUP INC. 
 AND 

U.S. BANK NATIONAL ASSOCIATION, 
 as Trustee 
  

 
 THIRD
SUPPLEMENTAL INDENTURE 
 Dated as of October 12, 2012 

to 
 Indenture

 Dated as of June 13, 2007 
 7 1/2% Senior Notes due 2017 

  
 1 

 This SUPPLEMENTAL INDENTURE (this “Supplemental Indenture”), dated as of
October 12, 2012, between BRISTOW GROUP INC., a Delaware corporation (the “Company”), the Guarantors named herein and U.S. BANK NATIONAL ASSOCIATION, a national banking association, as Trustee (the “Trustee”), under the
Indenture, dated as of June 13, 2007, as amended to date (the “Indenture”). Capitalized terms used herein and not otherwise defined shall have the meaning assigned to them in the Indenture. 

WITNESSETH: 
 WHEREAS, the Company has issued its 7 1/2% Senior Notes Due 2017 (the “Notes”) pursuant to the Indenture; 

WHEREAS, the Company has offered to purchase for cash any and all outstanding Notes pursuant to the tender offer commenced on
September 27, 2012 (the “Tender Offer”); 
 WHEREAS, in connection with the Tender Offer, the Company has
requested that Holders of the Notes deliver their consents with respect to the deletion of certain provisions of the Indenture; 

WHEREAS, Section 9.02 of the Indenture provides that the Company, the Guarantors and the Trustee may amend or supplement the
Indenture and the Notes with the consent of the Holders of at least a majority in aggregate principal amount of the then outstanding Notes (including, without limitation, consents obtained in connection with a tender offer or exchange offer for the
Notes); 
 WHEREAS, the Holders of at least a majority in aggregate principal amount of the outstanding Notes have duly
consented to the proposed modifications set forth in this Supplemental Indenture in accordance with the Indenture (including Section 9.02 thereof); 
 WHEREAS, the Company has heretofore delivered, or is delivering contemporaneously herewith, to the Trustee (i) a copy of resolutions of the Board of Directors of the Company authorizing the
execution of this Supplemental Indenture, (ii) evidence of the consent of the Holders set forth in the immediately preceding paragraph and (iii) the Officers’ Certificate and the Opinion of Counsel described in Section 9.06 of
the Indenture; and 
 WHEREAS, all conditions necessary to authorize the execution and delivery of this Supplemental
Indenture and to make this Supplemental Indenture valid and binding have been complied with or have been done or performed. 

NOW, THEREFORE, in consideration of the foregoing and notwithstanding any provision of the Indenture which, absent this
Supplemental Indenture, might operate to limit such action, the parties hereto, intending to be legally bound hereby, agree as follows: 
 ARTICLE ONE 
 AMENDMENTS 

SECTION 1.01 Amendments. 
 (a) Subject to Section 2.02 hereof, the Indenture is hereby amended by deleting in their entireties Sections 3.09, 4.03(b), 4.03(c), 4.04 (except for such portions thereof required by the Trust
Indenture Act of 1939), 4.05, 4.06, 4.07, 4.08, 4.09, 4.10, 4.11, 4.12, 4.13, 4.14, 4.15, 4.16, 5.01(a), 5.01(d), 6.01(c), 6.01(e), 6.01(f), 6.01(g), 6.01(h) and 6.01(i) of the Indenture. 

(b) Effective as of the date hereof, none of the Company, the Trustee or other parties to or beneficiaries of the
Indenture shall have any rights, obligations or liabilities under such Sections or Clauses and such Sections or Clauses shall not be considered in determining whether an Event of Default has occurred or whether the Company has observed, performed or
complied with the provisions of the Indenture. 
 SECTION 1.02 Amendment of Definitions. Subject to
Section 2.01 hereof, the Indenture is hereby amended by deleting any definitions from the Indenture with respect to which references would be eliminated as a result of the amendments of the Indenture pursuant to Section 1.01 hereof. The
Notes are also deemed amended as appropriate to reflect the amendments to the Indenture contemplated hereby. 

 ARTICLE TWO 
 MISCELLANEOUS 
 SECTION 2.01 Effect of Supplemental Indenture.
Except as amended hereby, all of the terms of the Indenture shall remain and continue in full force and effect and are hereby confirmed in all respects. From and after the date of this Supplemental Indenture, all references to the Indenture (whether
in the Indenture or in any other agreements, documents or instruments) shall be deemed to be references to the Indenture as amended and supplemented by this Supplemental Indenture. 

SECTION 2.02 Effectiveness. The provisions of this Supplemental Indenture shall be effective only upon execution and
delivery of this instrument by the parties hereto. Notwithstanding the foregoing sentence, the provisions of this Supplemental Indenture shall become operative only upon the purchase by the Company of at least a majority in principal amount of the
outstanding Notes pursuant to the Tender Offer, with the result that the amendments to the Indenture effected by this Supplemental Indenture shall be deemed to be revoked retroactively to the date hereof if such purchase shall not occur. 

SECTION 2.02 Governing Law. THE INTERNAL LAW OF THE STATE OF NEW YORK SHALL GOVERN AND BE USED TO CONSTRUE THIS
SUPPLEMENTAL INDENTURE. 
 SECTION 2.03 No Representations by Trustee. The recitals contained herein shall be
taken as the statement of the Company, and the Trustee assumes no responsibility for the correctness or completeness of the same. 
 SECTION 2.04 Counterparts. This Supplemental Indenture may be executed in any number of counterparts, each of which shall be an original; but such counterparts shall constitute but one and
the same instrument. 
 (signature page follows) 

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

			
	BRISTOW GROUP INC.
		
	By:	 	 /s/ Joseph A. Baj

	Name:	 	 Joseph A. Baj

	Title:	 	 Vice President and Treasurer

	
	BRISTOW U.S. LLC
		
	By:	 	 /s/ Joseph A. Baj

	Name:	 	 Joseph A. Baj

	Title:	 	 Vice President and Treasurer

	
	BRISTOW ALASKA INC.
		
	By:	 	 /s/ Joseph A. Baj

	Name:	 	 Joseph A. Baj

	Title:	 	 Vice President and Treasurer

	
	BRISTOW HELICOPTERS INC.
		
	By:	 	 /s/ Joseph A. Baj

	Name:	 	 Joseph A. Baj

	Title:	 	 Vice President and Treasurer

	
	BNHA HOLDINGS INC.
		
	By:	 	 /s/ Joseph A. Baj

	Name:	 	 Joseph A. Baj

	Title:	 	 Vice President and Treasurer

	
	U.S. BANK NATIONAL ASSOCIATION, as Trustee
		
	By:	 	 /s/ Susan Chadbourne

	Name:	 	 Susan Chadbourne

	Title:	 	 Vice PresidentTERMS DOCUMENT DATED OCTOBER 4, 2012

 Exhibit 4.1 
 CITIBANK CREDIT CARD ISSUANCE TRUST 
 Citiseries 

Class 2012-A1 Notes 
 Issuer Certificate 
 Pursuant to Sections 202 and 301(h) of the Indenture

 Reference is made to the Amended and Restated Indenture dated as of September 26, 2000, as amended and restated as
of August 9, 2011, between Citibank Credit Card Issuance Trust (the “Issuer”) and Deutsche Bank Trust Company Americas, as trustee (as so amended and restated, the “Indenture”). Capitalized terms used herein that are not
otherwise defined have the meanings set forth in the Indenture. All references herein to designated Sections are to the designated Sections of the Indenture. 
 Section 301(h) provides that the Issuer may from time to time create a tranche of Notes either by or pursuant to an Issuer Certificate setting forth the principal terms thereof. Pursuant to this
Issuer Certificate, there is hereby created a tranche of Notes having the following terms: 
 Series Designation: Citiseries. This series
is included in Group 1. 
 Tranche Designation: $500,000,000 0.55% Class 2012-A1 Notes of October 2015 (Legal Maturity Date October 2017)
(hereinafter, the “Class 2012-A1 Notes”) 
 Currency: The Class 2012-A1 Notes will be payable, and denominated, in Dollars.

 Denominations: The Class 2012-A1 Notes will be issuable in minimum denominations of $100,000 and multiples of $1,000 in excess of that
amount. 
 Issuance Date: October 4, 2012 
 Initial Principal Amount: $500,000,000 
 Issue Price: 99.94341% 

Interest Rate: 0.55% per annum, calculated on the basis of a 360 day year of twelve 30 day months. 

Scheduled Interest Payment Dates: The 7th day of each April and October, beginning April 2013. 

Each payment of interest on the Class 2012-A1 Notes will include all interest accrued from and including the preceding Interest Payment Date — or,
for the first interest period, from and including the Issuance Date — to and including the day preceding the current Interest Payment Date, plus any interest accrued but not previously paid. 

 The first deposit targeted to be made to the Interest Funding sub-Account for the Class 2012-A1 Notes will
be on the November 6, 2012 Interest Deposit Date and in an amount equal to $252,083.33. 
 Expected Principal Payment Date:
October 7, 2015 
 Legal Maturity Date: October 10, 2017 
 Monthly Principal Date: For the month in which the Expected Principal Payment Date occurs, October 7, 2015, and for each other month, the 7th day of such month, or if such day is not a
Business Day, the next following Business Day. 
 Required Subordinated Amount of Class B Notes: $29,914,550. 

Required Subordinated Amount of Class C Notes: $39,886,050. 
 Controlled Accumulation Amount: $41,666,667. 
 Form of Notes: The Class 2012-A1
Notes will be issued as Global Notes. The Global Notes will initially be registered in the name of Cede & Co., as nominee of The Depository Trust Company, and will be exchangeable for individual Notes only in accordance with the provisions
of Section 204(c). 
 Additional Issuances of Class 2012-A1 Notes: The Issuer may at any time and from time to time issue additional
Class 2012-A1 Notes, subject to the satisfaction of (i) the conditions precedent set forth in Section 311(a) and (ii) the following conditions: 
  

	 	(a)	The Issuer has obtained written confirmation from each Rating Agency that there will be no Ratings Effect with respect to the then outstanding Class 2012-A1 Notes as a
result of the issuance of such additional Class 2012-A1 Notes; 

  

	 	(b)	As of the date of issuance of the additional Class 2012-A1 Notes, all amounts due and owing to the Holders of the then outstanding Class 2012-A1 Notes have been paid
and there is no Nominal Liquidation Amount Deficit with respect to the then outstanding Class 2012-A1 Notes; 

  

	 	(c)	The additional Class 2012-A1 Notes will be fungible with the original Class 2012-A1 Notes for federal income tax purposes; 

 

	 	(d)	If Holders of the then outstanding Class 2012-A1 Notes have benefit of a Derivative Agreement, the Issuer will have obtained a Derivative Agreement for the benefit of
the Holders of the additional Class 2012-A1 Notes; and 

  

	 	(e)	The ratio of the Controlled Accumulation Amount to the Initial Dollar Principal Amount of the Class 2012-Aa Notes, including the additional Class 2012-A1 Notes, will be
equal to the ratio of the Controlled Accumulation Amount (before giving effect to the additional issuance) to the Initial Dollar Principal Amount of the Class 2012-A1 Notes, excluding the additional Class 2012-A1 Notes. 

  
 2 

 As of the date of issuance of additional Class 2012-A1 Notes, the Outstanding Dollar Principal Amount and
Nominal Liquidation Amount of the Class 2012-A1 Notes will be increased to reflect the Initial Dollar Principal Amount of the additional Class 2012-A1 Notes. 
 Any outstanding Class 2012-A1 Notes and any additional Class 2012-A1 Notes will be equally and ratably entitled to the benefits of the Indenture without preference, priority or distinction. 

Optional Redemption Provisions other than Section 1202 “Clean-Up Call”: None 

Additional Early Redemption Events or changes to Early Redemption Events: None 
 Additional Events of Default or changes to Events of Default: None 
 Business Day:
means any day other than (a) a Saturday or Sunday or (b) any other day on which national banking associations or state banking institutions in New York, New York or South Dakota, or any other state in which the principal executive offices
of any Additional Seller are located, are authorized or obligated by law, executive order or governmental decree to be closed. 
 Securities
Exchange Listing: None. 

  
 3 

 The Class 2012-A1 Notes shall have such other terms as are set forth in the form of Note
attached hereto as Exhibit A. Pursuant to Section 202, the form of Note attached hereto has been approved by the Issuer. 
  

			
	 CITIBANK CREDIT CARD ISSUANCE TRUST

	 By
	 	 Citibank, N.A.,

		 	as Managing Beneficiary
		
		 	 /s/ Douglas C. Morrison

		 	Douglas C. Morrison
		 	Vice President

 Dated: October 4, 2012 

  
 4 

 Citiseries 
 Class 2012-A1 Notes 
 Reference is made to the resolutions adopted by the
Board of Directors of Citibank, N.A. on July 19, 2011. The resolutions authorize Citibank, N.A. from time to time to issue and sell, or to arrange for or participate in the issuance and sale of, one or more series and/or classes of pass-through
certificates, participation certificates, commercial paper, notes, bonds or other securities representing ownership interests in, or backed or secured by, pools of credit card receivables or interests therein (the “Receivables”) in an
aggregate principal amount such that up to $100,000,000,000 of such certificates, commercial paper, notes, bonds or other securities are outstanding at any one time and to sell, transfer, convey, assign or pledge or grant a security interest in all
or any portion of its Receivables to Citibank Credit Card Master Trust I, Citibank Omni Trust or any direct or indirect subsidiaries of Citibank, N.A., affiliates of Citigroup Inc., additional trusts or other entities or trustees in connection
therewith on such terms as to be determined by the Citibank, N.A. Securitization Pricing and Loan Committee (the “Pricing and Loan Committee”). 
 The undersigned, a duly authorized member of the Pricing and Loan Committee, on behalf of such Pricing and Loan Committee, does hereby certify that the preceding Issuer Certificate, the terms of the
tranche of Notes set forth in and to be created by the Issuer Certificate and the increase in the Invested Amount of the Collateral Certificate resulting from the issuance of such Notes have been approved by such Pricing and Loan Committee. In
addition, the following underwriting/selling agent terms with respect to this tranche of Notes have been approved by such Pricing and Loan Committee: 
 Issue Price: 99.94341% 
 Underwriting Commission: 0.250% 

Proceeds to Issuer: 99.69341% 
 Representative of the Underwriters: Citigroup Global Markets Inc. 
 The preceding
Issuer Certificate and this certification of Pricing and Loan Committee approval shall be, continuously from the time of their execution, official records of Citibank, N.A. 

 

	
	 /s/ Douglas C. Morrison

	Douglas C. Morrison
	Member of the Securitization Pricing and Loan Committee
	Citibank, N.A.

 Dated: October 4, 2012 

  
 5 

 Exhibit A 
 FORM OF 
 CITISERIES 

0.55% CLASS 2012-A1 NOTES OF OCTOBER 2015 
 (Legal Maturity Date October 2017) 
  

					
	 $500,000,000
	 		 	REGISTERED
	 CUSIP No. 17305E EW1
	 		 	No. R-

 UNLESS THIS NOTE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY, A NEW YORK
CORPORATION (“DTC”), TO THE ISSUER OR ITS AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE OR PAYMENT, AND ANY NOTE ISSUED IS REGISTERED IN THE NAME OF CEDE & CO. OR IN SUCH OTHER NAME AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE
OF DTC (AND ANY PAYMENT IS MADE TO CEDE & CO. OR TO SUCH OTHER ENTITY AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL INASMUCH AS THE
REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST HEREIN. 
 THE PRINCIPAL OF THIS NOTE IS PAYABLE AS SET FORTH
HEREIN AND IN THE INDENTURE REFERRED TO BELOW. ACCORDINGLY, THE OUTSTANDING PRINCIPAL AMOUNT OF THIS NOTE AT ANY TIME MAY BE LESS THAN THE AMOUNT SHOWN ON THE FACE HEREOF. 
 CITIBANK CREDIT CARD ISSUANCE TRUST 
 CITISERIES 

0.55% CLASS 2012-A1 NOTES OF OCTOBER 2015 
 (Legal Maturity Date October 2017) 
 CITIBANK CREDIT CARD ISSUANCE TRUST, a trust formed and
existing under the laws of the State of Delaware (including any successor, the “Issuer”), for value received, hereby promises to pay to CEDE & CO., or its registered assigns, the principal amount of FIVE HUNDRED MILLION DOLLARS
($500,000,000). The Expected Principal Payment Date for this Note is October 7, 2015. The Legal Maturity Date for this Note is October 10, 2017. 
 The Issuer hereby promises to pay interest on this Note at the rate of 0.55% per annum on the 7th day of each April and October, beginning April 2013, until the principal of this Note is paid or made
available for payment, subject to certain limitations set forth in the Indenture. Interest will accrue on the principal amount of this Note outstanding on the preceding Interest Payment Date 

 
(after giving effect to any payments of principal made on the preceding Interest Payment Date), or with respect to the first Interest Payment Date, the initial principal amount of this Note.
Interest will accrue from October 4, 2012 and be computed on the basis of a 360-day year of twelve 30-day months. 
 If any Interest
Payment Date or Principal Payment Date of this Note falls on a day that is not a Business Day, the required payment of interest or principal will be made on the following Business Day. 
 This Note is one of the Citiseries, Class 2012-A1 Notes issued pursuant to the Amended and Restated Indenture dated as of September 26, 2000, as amended and restated as of August 9, 2011 (as
amended and otherwise modified from time to time, the “Indenture”) between the Issuer and Deutsche Bank Trust Company Americas, as Trustee. For purposes of this Note, the term “Indenture” includes any supplemental indenture or
Issuer Certificate relating to the Citiseries, Class 2012-A1 Notes. This Note is subject to all of the terms of the Indenture. All terms used in this Note that are not otherwise defined herein and that are defined in the Indenture will have the
meanings assigned to them therein. 
 The principal of and interest on this Note are payable in such coin or currency of the United States of
America as at the time of payment is legal tender for payment of public and private debts. 
 Reference is made to the further provisions of
this Note set forth on the reverse hereof, which will have the same effect as though fully set forth on the face of this Note. 
 Unless the
certificate of authentication hereon has been executed by the Trustee whose name appears below by manual signature, this Note will not be entitled to any benefit under the Indenture, or be valid or obligatory for any purpose. 

 IN WITNESS WHEREOF, the Issuer has caused this instrument to be signed, manually or in facsimile, by an
Issuer Authorized Officer. 
  

					
	 CITIBANK CREDIT CARD ISSUANCE TRUST

		
	 By:
	 	 CITIBANK, N.A.,

		 	 as Managing Beneficiary of

		 	 Citibank Credit Card Issuance Trust

			
		 	 By:
	 	  

		 		 	Douglas C. Morrison
		 		 	Vice President

 Dated: October 4, 2012 
 TRUSTEE’S CERTIFICATE OF AUTHENTICATION 
 This is one of the Notes designated above and
referred to in the within mentioned Indenture. 
  

			
	 DEUTSCHE BANK TRUST COMPANY AMERICAS,

	 as Trustee under the Indenture

		
	By:	 	  

		 	Authorized Signatory

 Dated: October 4, 2012 

 REVERSE OF NOTE 
 This Note is one of a duly authorized issue of Notes of the Issuer, designated as its Citiseries 0.55% Class 2012-A1 Notes of October 2015 (Legal Maturity Date October 2017) (herein called the
“Notes”), all issued under an Indenture, to which Indenture reference is hereby made for a statement of the respective rights and obligations thereunder of the Issuer, the Trustee and the Holders of the Notes. 

This Note ranks pari passu with all other Class A Notes of the same series, as set forth in the Indenture. This Note is secured to the extent, and
by the collateral, described in the Indenture. 
 The Issuer will pay interest on overdue interest as set forth in the Indenture to the extent
lawful. 
 Each Holder by acceptance of this Note, and each owner of a beneficial interest in this Note by acceptance of a beneficial interest
in this Note, agrees that no recourse may be taken, directly or indirectly, with respect to the obligations of the Issuer or the Trustee on the Notes, against the Issuer, the Issuer Trustee, Citibank, N.A., the Trustee or any affiliate, officer,
employee or director of any of them, and the obligation of the Issuer to pay principal of or interest on this Note or any other amount payable to the Holder of this Note will be subject to Article V of the Indenture. 

Each Holder by acceptance of this Note, and each owner of a beneficial interest in this Note by acceptance of a beneficial interest in this Note, agrees
that this Note is intended to be debt of Citibank, N.A. for federal, state and local income and franchise tax purposes, and agrees to treat this Note accordingly for all such purposes, unless otherwise required by a taxing authority. 

Each Holder by acceptance of this Note, and each owner of a beneficial interest in this Note by acceptance of a beneficial interest in this Note, agrees
that it will not at any time institute against the Issuer, or join in any institution against the Issuer of, any bankruptcy, reorganization, arrangement, insolvency or liquidation proceeding, or other proceedings under any United States federal or
state bankruptcy or similar law in connection with any obligations relating to this Note, the Indenture or any Derivative Agreement. 
 This
Note and the Indenture will be construed in accordance with and governed by the laws of the State of New York. 
 Certain amendments may be made
to the Indenture without the consent of the Holder of this Note. This Note must be surrendered for final payment of principal and interest. 

 ASSIGNMENT 
 Social Security or taxpayer I.D. or other identifying number of
assignee:                                       
   
 FOR VALUE RECEIVED, the undersigned hereby sells, assigns and transfers unto 

 
  

 
  

(name and address of assignee) 

the within Note and all rights thereunder, and hereby irrevocably constitutes and
appoints                                       
                      , attorney, to transfer said Note on the books kept for registration thereof, with full power of substitution in
the premises. 
  

							
	 Dated:
	 		 		 	 *

		 		 		 	Signature Guaranteed:

  

	*	NOTE: The signature to this assignment must correspond with the name of the registered owner as it appears on the face of the within Note in every particular without
alteration, enlargement or any change whatsoever.

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