Document:

Filed by Bowne Pure Compliance

Exhibit
10.3

AMENDMENT No. 5 TO AMENDED AND RESTATED

PURCHASE AGREEMENT DCT-021/03

This Amendment No. 5 to the Amended and Restated Purchase Agreement DCT-021/03, dated as of June
30, 2008 (“Amendment No. 5”) relates to the Amended and Restated Purchase Agreement DCT-021/03 (the
“Purchase Agreement”) between Embraer — Empresa Brasileira de Aeronáutica S.A. (“Embraer”) and US
Airways Group, Inc. (“Buyer”) dated June 13, 2006, as amended from time to time (collectively
referred to herein as “Agreement”). This Amendment No. 5 is between Embraer and Buyer,
collectively referred to herein as the “Parties”.

This Amendment No. 5 sets forth additional agreements between Embraer and Buyer with respects to
the matters set forth herein.

Except as otherwise provided for herein, all terms of the Purchase Agreement shall remain in full
force and effect. All capitalized terms used in this Amendment No. 5 which are not defined herein
shall have the meaning given in the Purchase Agreement. In the event of any conflict between this
Amendment No. 5 and the Purchase Agreement, the terms, conditions and provisions of this Amendment
No. 5 shall control.

WHEREAS, the Bureau of Labor Statistics has discontinued publishing certain Labor Indices which are
contained in the Escalation Formula, and

WHEREAS, pursuant to the Proposal of Major Change dated March 02, 2007, Embraer and Buyer have
agreed to change the rechargeable flashlights of certain Aircraft to non-rechargeable ones and
revise the unit Aircraft Basic Price accordingly.

NOW, THEREFORE, for good and valuable consideration which is hereby acknowledged, Embraer and Buyer
hereby agree as follows:

1. Changes in the Escalation Formula

Since the Labor Indices ** and ** (as such indices are referred to in Attachment “D” to the
Purchase Agreement) are no longer published by the Bureau of Labor Statistics (“BLS”) of the US
Department of Labor, the Purchase Price for all Aircraft shall be calculated as described below.

	 	1.1	 	For the period from January 2003 up to May 2008, the Basic Price shall be escalated
according to Attachment “D” of the Purchase Agreement and the resulting escalation for
such period is **.

	 	1.2	 	For the period from May 2008 up to the Contractual Delivery Month, the Basic Price
shall be escalated according to Attachment “D1”, attached to this Amendment No. 5, which
shall be incorporated into the Purchase Agreement.

	 	1.3	 	Any references to Attachment “D” shall be deemed references to Attachments “D” and
“D1”, collectively, and any application of the Escalation Formula required under the
Purchase Agreement shall follow the procedure described in this Article 1 to this
Amendment No. 5.

 

			
	Amendment No. 5 to Purchase Agreement DCT-021/03

	 	 	 
	**	 	Confidential Treatment Requested.

 

Page 1 of 3

 

2. Flashlights

The ** and ** Aircraft shall be delivered with non-rechargeable flashlights. **. The Aircraft Basic
Price of ** Aircraft shall be increased by US$ ** (**) in ** economic conditions to reflect this
change.

3. Aircraft Basic Price

3.1 Article 3.1 of the Purchase Agreement shall be deleted and replaced by the following:

“3.1 Buyer agrees to pay Embraer, in United States dollars, the following unit Aircraft Basic Price
in ** economic conditions:

	 	 	 	 	 
	EMBRAER 190 Initial Aircraft

**
	 	US$  **
	EMBRAER 190 Initial Aircraft

**
	 	US$  **
	EMBRAER 190 Initial Aircraft

**
	 	US$  **
	EMBRAER 190 Additional Aircraft
	 	  US$  **”

3.2 The unit Option Aircraft Basic Price of US$ ** in Article 21.3 of the Purchase Agreement shall
be deleted and replaced by US$ **.

4. Miscellaneous

All other terms and conditions of the Purchase Agreement which are not specifically amended or
modified by this Amendment No. 5, shall remain in full force and effect without any change.

 

			
	Amendment No. 5 to Purchase Agreement DCT-021/03

	 	 	 
	**	 	Confidential Treatment Requested.

 

Page 2 of 3

 

IN WITNESS WHEREOF, EMBRAER and BUYER, by their duly authorized officers, have entered into and
executed this Amendment No. 5 to Purchase Agreement to be effective as of the date first written
above.

	 	 	 	 	 	 	 	 	 
	EMBRAER – Empresa
Brasileira de Aeronáutica S.A.	 	US Airways Group, Inc.	 	 
	 	 	 	 	 	 	 
	 
	 	 	 	 	 	 	 	 
	By

	 	/s/ Mauro Kern Junior
	 	By
	 	/s/ Thomas T. Weir	 	 
	Name:

	 	 

Mauro Kern Junior
	 	Name:
	 	 

Thomas T. Weir
	 	 
	Title:

	 	Executive Vice President
	 	Title:
	 	Vice President & Treasurer	 	 
	 

	 	Airline Market	 	 	 	 	 	 
	 
	 	 	 	 	 	 	 	 
	By

	 	/s/ Jose Luis D. Molina
	 	Date:
	 	June 30, 2008	 	 
	Name:

	 	 

Jose Luis D. Molina
	 	Place:
	 	Phoenix, Arizona, U.S.A.	 	 
	Title:

	 	Vice President Contracts	 	 	 	 	 	 
	 

	 	Airline Market	 	 	 	 	 	 
	 
	 	 	 	 	 	 	 	 
	Date:

	 	June 30, 2008	 	 	 	 	 	 
	Place:

	 	S. Jose Dos Campos, Brazil	 	 	 	 	 	 
	 
	 	 	 	 	 	 	 	 
	Witness:
	 	/s/ Julieta Diederichsen
	 	Witness: 
	 	/s/ David Lin	 	 
	Name:

	 	  

Julieta Diederichsen
	 	Name:
	 	 

David Lin
	 	 

 

			
	Amendment No. 5 to Purchase Agreement DCT-021/03

 

Page 3 of 3

 

ATTACHMENT “D1”

PRICE ESCALATION FORMULA

All Indices mentioned below are based on the United States publications “Employment and Earnings”
and “Producer Price Indexes”, published by the Bureau of Labor Statistics of the US Department of
Labor (http://stats.bls.gov), that reflect the variations on the prices of labor and commodities on
the USA market.

**

	 	 	 
	Attachment D1 to Amended and Restated Purchase Agreement DCT-021/03

	 	 	 
	**	 	Confidential Treatment Requested.

 

Page 1 of 3Filed by Bowne Pure Compliance

Exhibit 10.1

PHANTOM PERFORMANCE SHARE AWARD

Date of Award: February [•], 2008

Target Number of Phantom Performance Shares Awarded: x,xxx

Recipient

Dear (name):

I am pleased to inform you that as an executive of Terra Industries Inc. (“Terra”) or a
subsidiary thereof, you have been awarded, under Terra’s 2007 Omnibus Incentive Compensation Plan
(the “Plan”), the number of Phantom Performance Shares set forth above, subject to certain
restrictions, terms and conditions set forth in this letter and in the Plan. Pursuant to the Plan,
the Phantom Performance Shares are Restricted Stock Units that are settled in cash and are
designated as Performance Compensation Awards. Unless otherwise defined, the capitalized terms
herein shall have the meanings assigned to them in the Plan.

1. For each Phantom Performance Share that you earn (or are deemed to earn) pursuant to this
Agreement, you will be entitled to a cash payment, less applicable taxes, in an amount equal to the
average Fair Market Value (as defined in the Plan) of one Share for the last 20 trading days of
2010. A Share shall mean a share of common stock of Terra, without par value, or such other
securities of Terra (a) into which such shares shall be changed by reason of a recapitalization,
merger, consolidation, split-up, combination, exchange of shares or other similar transaction or
(b) as may be determined by the Committee pursuant to Section 4(b) of the Plan. Subject to the
terms and conditions set forth in this Agreement and the Plan, you will be eligible to earn a
number of Phantom Performance Shares that is between 0% and 200% of the target number of Phantom
Performance Shares set forth above, such number of earned Phantom Performance Shares to be
determined based on Terra’s annualized average return on capital employed (“ROCE”), described as
follows:

a. The ROCE period will be the thirty-six month period ending on December 31, 2010 (referred
to hereafter as the “Period”).

b. The numerator of the calculation will be the annualized average of the sum of income from
operations for the Period (as reported in Terra’s Consolidated Statement of Operations for 2008,
2009 and 2010), reduced by 35% representing normal income tax expense, plus income or earnings from
equity investments and results from discontinued operations.

 

 

 

c. The denominator of the calculation will be the average of the amounts reported on the
twelve Terra quarterly balance sheets for the Period for the following items: Common shareholders
and preferred shareholders equity, short and long-term debt, deferred income taxes and minority
interest, liability for customer prepayments, less cash.

d. The determination of the numerator and denominator used for the calculation of ROCE will
not include the following items:

	 	i.	 	Losses that are the direct result of a major casualty, force majeure
or natural disaster;

	 	ii.	 	Losses for new legislation that directly affects Terra’s existing
product mix;
	 
	 	iii.	 	Losses that are the result of a terrorist attack;

	 	iv.	 	Losses associated with shipping restrictions imposed by Terra’s
freight vendors for Terra’s products;
	 
	 	v.	 	Impairment of long-lived assets, goodwill or other intangible assets;

	 
	 	vi.	 	Losses on the early retirement of debt;

	 	vii.	 	Equity-based or other employee retention awards granted in the
connection with any acquisition;
	 
	 	viii.	 	Amortization of goodwill;
	 
	 	ix.	 	Expenses classified as provisions for restructuring;

	 	x.	 	Losses on the disposal of assets or segments of an acquired business
within three years of the acquisition date;
	 
	 	xi.	 	Losses on the disposition of a business;

	 	xii.	 	Expenses associated with changes in tax or accounting regulations or
laws; and

	 	xiii.	 	Other expenses or losses that are unusual in nature or infrequent in
occurrence and are disclosed as a separate item in Terra’s Consolidated Statement
of Operations.

e. In each instance, the above-referenced items must be determined in accordance with
generally accepted accounting principles and appear on the face of Terra’s Consolidated Statement
of Operations contained in its Consolidated Financial Statements for such performance year.

f. The Compensation Committee may, in its sole discretion, include any of the preceding items
in its calculation of the return amount if the inclusion of such item or items has the effect of
decreasing level of ROCE achieved.

g. If Terra’s annualized average ROCE for the Period is [ ] or less, none of the Phantom
Performance Shares will be earned.

h. If Terra’s annualized average ROCE for the Period is greater than [ ] but less than or
equal to [ ], [ ] of the target number of Phantom Performance Shares will be earned for each [ ] by
which annualized average ROCE exceeds [ ].

 

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i. If Terra’s annualized average ROCE for the Period is greater than [ ] but less than [ ], an
additional [ ] of the target number of Phantom Performance Shares will be earned for each [ ] by
which annualized average ROCE exceeds [ ].

j. If Terra’s annualized average ROCE for the Period equals or exceeds [ ], then 200% of the
target number of Phantom Performance Shares (which is the maximum number of Phantom Performance
Shares that may be earned pursuant to this Award) will be earned.

2. The calculation of ROCE will be determined by the Committee following the end of the
Period. Until the Committee has made its determination about the level of achievement of ROCE and
the percentage of the Phantom Performance Shares that have been earned, you will not be entitled to
receive any cash payment pursuant to this Agreement. In determining the percentage of Phantom
Performance Shares that you have earned during the Period, the Compensation Committee may not award
more Phantom Performance Shares than the maximum amount indicated by the formula set forth above,
but may, in its sole discretion, award fewer than the maximum amount indicated by the formula.

3. Any cash payment that is required to be made to you after the Committee approves the
portion, if any, of the target number of Phantom Performance Shares that is earned based on Terra’s
performance during the Period (including any cash that you may be entitled to receive following a
termination as a result of Disability) shall be paid to you not later than the 74th day following
the date that such Phantom Performance Shares become vested. Phantom Performance Shares will be
deemed to have vested when they are no longer subject to a substantial risk of forfeiture (within
the meaning of Treasury Regulation Section 1.409A-1(d)).

4. In the event of a Change of Control of Terra on or prior to the last day of the Period, the
number of Phantom Performance Shares that you will be deemed to have earned will be the greater of
(a) the calculated award described in paragraphs 1.a. through g. above using the actual quarters
completed in the Period and (b) the target number of Phantom Performance Shares. In the event of a
Change of Control of Terra on or prior to the last day of the Period, any cash required to be paid
to you in respect of your Phantom Performance Shares will be paid not later than 30th day following
the consummation of such Change of Control.

5. If your employment with Terra terminates for any reason during the Period and prior to the
occurrence of a Change of Control, all unearned Phantom Performance Shares shall automatically be
forfeited by you, except as follows:

a. If your employment terminates by reason of death, the amount of cash payable with respect
to your Phantom Performance Shares shall be calculated as described in paragraphs 1.a. through g.
of this Agreement using the actual quarters completed prior to the date of death. You may
designate one or more beneficiaries by providing written notice to Terra’s Corporate Secretary.
Beneficiaries may be named contingently or
successively and may share in different proportions if so designated. Any cash payable in
respect of your Phantom Performance Shares shall be paid to your estate or beneficiary not later
than the 74th day following the date of death.

 

-3-

 

b. If you cease to be actively employed by reason of Disability, the Phantom Performance
Shares shall continue to be eligible for issuance pursuant to paragraphs 1.a. through g. of this
Agreement and, if applicable, paragraph 4 of this Agreement.

c. If your employment with Terra and its Subsidiaries terminates under special circumstances
(other than death or Disability), as determined by the Committee in its sole discretion, the
Committee shall determine, in a manner consistent with Section 162(m) of the Internal Revenue Code,
the number, if any, of Phantom Performance Shares that shall not be forfeited upon termination, and
the timing of any payment in respect of such Phantom Performance Shares that is made to you.

6. Although the Phantom Performance Shares are intended to provide you with an economic
equivalent of stock ownership, the award of Phantom Performance Shares hereunder shall not entitle
you to vote or exercise any of the other rights of a holder of Shares (including the receipt of
dividends or dividend equivalents).

7. Terra shall be entitled to withhold the amount of any tax attributable to any amount
payable hereunder.

8. Nothing in this Phantom Performance Share Award shall confer upon you any right to continue
in the employ of Terra or a Subsidiary, or affect the right of Terra or of any Subsidiary to
terminate your employment, with or without cause.

9. (i) It is intended that the provisions of this Agreement comply with Section 409A of the
Code and the regulations thereunder as in effect from time to time (“Section 409A”), and all
provisions of this Agreement shall be construed and interpreted in a manner consistent with the
requirements for avoiding taxes or penalties under Section 409A.

(ii) Neither you nor any of your creditors or beneficiaries shall have the right to subject
any deferred compensation (within the meaning of Section 409A) payable under this Agreement to any
anticipation, alienation, sale, transfer, assignment, pledge, encumbrance, attachment or
garnishment. Except as permitted under Section 409A, any deferred compensation (within the meaning
of Section 409A) payable to you or for your benefit under this Agreement may not be reduced by, or
offset against, any amount owing by you to Terra or any of its Affiliates.

(iii) If, at the time of your separation from service (within the meaning of Section 409A),
(A) you shall be a specified employee (within the meaning of Section 409A and using the
identification methodology selected by Terra from time to time) and (B) Terra shall make a good
faith determination that an amount payable hereunder constitutes deferred compensation (within the
meaning of Section 409A) the payment of which is required to be delayed pursuant to the six-month
delay rule set forth in Section 409A in
order to avoid taxes or penalties under Section 409A, then Terra shall not pay such amount on
the otherwise scheduled payment date but shall instead pay it, without interest, on the first
business day after such six-month period.

 

-4-

 

(iv) Notwithstanding any provision of this Agreement to the contrary, in light of the
uncertainty with respect to the proper application of Section 409A, Terra reserves the right to
make amendments to this Agreement as Terra deems necessary or desirable to avoid the imposition of
taxes or penalties under Section 409A. In any case, you shall be solely responsible and liable for
the satisfaction of all taxes and penalties that may be imposed on you or for your account in
connection with this Agreement (including any taxes and penalties under Section 409A), and neither
Terra nor any of its Affiliates shall have any obligation to indemnify or otherwise hold you
harmless from any or all of such taxes or penalties.

10. Terra’s obligation with respect to this Award shall not be funded or secured in any
manner.

11. Your rights with respect to these Phantom Performance Shares may not be assigned or
transferred in any manner and shall not be subject to any lien, claim, encumbrance, obligation or
liability of any kind. This Agreement shall be construed in accordance with and governed by the
laws of the State of State of Maryland without regard to any State’s conflict of laws principles.

These Phantom Performance Shares are awarded pursuant to the Plan and are subject to its
terms. A copy of the Plan is being furnished to you with this letter and also is available on
request from Terra’s Corporate Secretary.

If you have any questions with respect to this Phantom Performance Share Award, please feel
free to call upon me.

	 	 	 	 	 
	 	Very truly yours,

TERRA INDUSTRIES INC.

 	 
	 	By:  	 	 
	 	 	President and Chief Executive Officer 	 
	 	 	 	 
	 
	 	 	 
	 	By:  	
 	 
	 	 	Vice President, General Counsel
and Corporate Secretary 	 
	 

 

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