Document:

EX-4.31

 Exhibit 4.31 

Supplemental Agreement to the Financial Services 

Framework Agreement 
 The Supplemental
Agreement was signed by Party A and Party B in Guangzhou as at 2018 
 China Southern Airlines Company Limited (hereinafter referred to as
“Party A”) 
 Address: No. 278 Ji Chang Road, Guangzhou 

Legal representative: Wang Chang Shun (王昌顺) 
 Southern Airlines Group Finance Company Limited (hereinafter referred to as “Party
B”) 
 Address: No. 17 Yunnan Street, Ji Chang Road, Guangzhou 

Legal representative: Wang Jianjun (王建军) 

Party A and Party B signed this Supplemental Agreement based on the Financial Services Framework Agreement signed by both parties on
29 August 2016 (the “Original Agreement”) after arm’s length negotiation, with the detailed terms as follows: 

I.    Change the content in clause 1 of section 8 (the “Transaction Cap”) in the Original Agreement to:
“each party to this Agreement mutually agreed that the balance of deposits (including accrued interests) of Party A in Party B in any day since the effective day of this Agreement shall not exceed RMB10 billion, and the balance (including
the total interest expense) of loan provided by Party B in any day shall not exceed the aforesaid amount as well.” 

  
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 II.    This Supplemental Agreement shall be deemed as the supplement to the
Original Agreement. Any contradiction between the terms of the Original Agreement and this Supplemental Agreement, the later shall prevail. 

III.    This Supplemental Agreement shall take effect from the date as approved by the general meeting of Party A. 

IV.    This Supplemental Agreement was made in four counterparts. Both parties hold two counterparts and each one has the
same legal effect. 
 (No text below) 

(This page is the signature page of the Supplemental Agreement to the Financial Services Framework Agreement) 

Party A: China Southern Airlines Company Limited 

Authorized representative: 

Party B: Southern Airlines Group Finance Company Limited 

Authorized representative: 

  
 2EX-4.32

 Exhibit 4.32 

Sale and Purchase Agreement 

Party A: China Southern Airlines Company Limited 

Address: 68 Qixin Road, Baiyun District, Guangzhou 

Fax: 
 Party B: Zhuhai China
Southern Air Real Property Development Co., Ltd. 
 Address: Room 1301, Citics CSA International Plaza Office Building, 52 Jida Haibin
South Road, Zhuhai 
 Fax: 0756-3368016 

Party A’s Xiangyi Company in the Zhuhai free trade zone needs to settle the supporting living security needs for pilots’ simulation
training. Party B is a company specializing in property development and project construction. The land at No. 36 of Zhuhai free trade zone of Party B has been identified as for office, hotel and commercial use. After planning adjustment, such
land was divided into two land parcels (southern land parcel and the northern land parcel). The northern land parcel has a gross floor area of 42,330.99 square meters with a plot ratio of 4.8 and a plot ratio-based floor area of approximately
203,188.75 square meters. The operation of Party B’s company is in good condition and it has extensive experience on real estate development and construction. The landmark building of Zhuhai Citics CSA International Plaza has been successfully
developed. 

  

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 To sum up, Party A and Party B agreed as follows on matters relating to the customized purchase
and sale of training supporting facilities for pilots of Xiangyi, after fully communication and negotiation: 
 I. Scale and content of
project construction 
 Party A put forward the usage requirements for pilots’ training supporting facilities of Xiangyi and Party B
prepared the planning scheme for the supporting facilities based on the usage requirements. After communication, both parties mutually agreed that this supporting facility locating at west side of the northern land parcel of No. 36 of Zhuhai
free trade zone (project name: Standard Services Research and Development and Training Centre for Zhuhai International Civil Aviation) is planned to be constructed as hotel (i.e. tower A1, Phase I, hereinafter referred to as the CSA Hotel), and has
a total gross floor area of approximately 60,927.8 square meters, including skirt building, tower building over ground and basement. In particular, the 1F-2F will be skirt building of approximately 6055.8m2; 3F-42F will be tower building of approximately 43,350m2; and underground floor will be the basement of
approximately 11,522m2. The above gross floor area is the estimated area at the planning stage, while the actual delivery shall be the actually measured area. If the actual area differs from the
agreed area hereunder or the planned area, completed area and other area, no makeup shall be made. Party B shall be responsible for the application procedures for construction and approval. The final planning scheme and gross floor area are detailed
in the planning permit and construction permit issued by the government. 

  

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 II. Mode of customized purchase and sale of projects 

Both parties agreed to develop and construct the project of supporting facilities for pilot training of Xiangyi. Party A shall be responsible
for putting forward the requirements of the supporting facilities and make prompt feedback and confirmation when Party B asks for advice in respect of the scheme of the supporting facilities and designate a special working group to communicate with
Party B and undertake to purchase such supporting facilities. 

  

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 According to the requirements proposed by Party A, the project satisfies the security function
for training pilots by Xiangyi. The project has 980 rooms and the function of facilities includes restaurant, conference room, swimming pool, fitness center, hotel management room, kitchen, etc. The project shall be decorated according to the
standard of four-star hotel and the list of equipment, materials and brands is detailed in the appendix. For items not listed on the list, they shall be implemented in accordance with the standard of the four-star hotel, Zhuhai Fuhuali Pullman
(珠海富华里铂尔曼酒店). 
 Party B shall be responsible for the whole process of
preparation, design, construction, delivery and handling of ownership certificates for the scheme of the supporting facilities based on Party A’s requirements. Party undertook to sell the facilities to Party A at the price as agreed by both
parties and shall be responsible for handling the certificate of ownership for completed projects. 
 Party B shall undertook that the land
ownership of the construction project is clear, the land use satisfies the construction condition and the land parcel of the project has no pledge other than development loans. During the period of performing this Agreement, Party B has been holding
legal and effective qualification for development. 

  

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 III. Progress of project 

The subject project hereunder is intended to be delivered on 30 September 2021. The key progress nodes in the progress of development are
expected as the following table, provided that the actual time shall prevail and the final delivery time shall not be changed: 
  

					
	 Progress nodes
	  	 Estimated time
	  	 Acknowledgement mark

	Commencement	  	30 September 2018	  	Construction permit
			
	Main contractor of the civil engineering entering into the site	  	Before 30 June 2019	  	Commencement order of main contractor
			
	The progress of the civil engineering completing one second of the total gross floor area	  	Before 30 December 2019	  	Issuing the construction progress report by supervisor
			
	Capping	  	Before 30 June 2020	  	Issuing the construction progress report by supervisor
			
	Commencement of fine decoration	  	Before 30 September 2020	  	Commencement order of fine decoration
			
	Completion	  	Before 30 December 2020	  	Acceptance certificate
			
	 Delivery
	  	30 September 2021	  	Notice of occupation/delivery

  

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 IV. Determination of transaction price and execution of contract 

(I) Determination of the total transaction price 

Both parties mutually agreed to develop and construct the subject project hereunder under the provisions of this Agreement. The tentative total
transaction price (tax included) of the subject project hereunder was RMB798.56 million (the “Tentative Total Transaction Price”). Of which, the total transaction price excluding value-added tax was RMB725.9636 million, the
amount of value-added tax was RMB72.5964 million and rate of value-added tax was 10%. 

  

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 If in the actual construction and development process, the total development expense of the
subject project hereunder increases due to Party A’s adjustment to this Agreement, the Tentative Total Transaction Price of this Agreement shall be adjusted according to the changed development expense. Other than this, the Tentative Total
Transaction Price shall not be adjusted for any other factors (including but not limited to changes in material price, machine expense and staff cost for market’s reason). 

Both parties agreed to jointly engage an engineering cost consulting company after initial registration to approve the cost of the project and
engage a professional audit institution to calculate each tax of the project (see appendix 17 for details). The total transaction price (tax included) of the subject project hereunder shall be fixed after both parties’ acknowledgement and shall
be used to adjust the tentative total transaction price (tax included) of this Agreement of RMB798.56 million. Both parties agreed that, if the total transaction price (tax included) confirmed in the above audit and recognized by both parties
is higher than RMB798.56 million, such amount shall be the total transaction price (tax included); if it is lower than RMB798.56 million, the total transaction price (tax included) confirmed in the audit and recognized by both parties
shall be the total transaction price (tax included). 

  

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 (II) Execution of commercial housing purchase and sale agreement 

This Agreement is a customized commercial housing purchase and sale agreement. Upon the subject project hereunder meets the signing conditions,
a commercial housing purchase and sale contract (presale) (if any) shall be signed and filed for record. Upon the project’s total transaction price (tax included) is confirmed, a commercial housing purchase and sale contract (for sale now)
shall be signed for filing and handling the title certificate of real estate. The model commercial housing purchase and sale contract is detailed in appendix 12. Where there is change to the express of terms of contract as required by Zhuhai real
estate trading center at the time a formal commercial housing purchase and sale contract is signed, such contract shall be amended as required by the government. 

  

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 Unless as otherwise agreed or otherwise required by law, agreements on contents such as delivery
time, delivery standards, quality warranty shall be automatically included in the commercial housing purchase and sale contract (presale) or commercial housing purchase and sale contract (for sale now). Upon the subject project hereunder meets the
signing conditions, if a party hereunder do not enter into the commercial housing purchase and sale contract (presale) or commercial housing purchase and sale contract (for sale now) with the other party out of subjective reasons, the default party
shall assume the default liabilities pursuant to the default clauses of this Agreement and reimburse the other party for the loss arise therefrom. 

V. Payment 
 Both parties
agreed that, the tentative total transaction price (tax included) of RMB798.56 million agreed by this Agreement being the basis of Party A’s installment, the fulfillment of key progress nodes satisfying the payment conditions, Party A
shall pay as agreed the corresponding amount within 10 working days after Party B giving Party A the payment notice and corresponding proof materials (see appendix 15 for details). Details are as follows: 

 

	 	•	 	 Signing this Agreement before 28 December 2018 and paying 10% of the tentative total transaction price (tax
included) by Party A the day after the signing; (obtaining construction permit); 

  

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	 	•	 	 Main contractor of civil engineering entering into the site (before 30 March 2019 or around), paying 10% of
the tentative total transaction price (tax included); (issuing commencement order by main contractor) 

  

	 	•	 	 Completing one second of the total gross floor area in respect of the civil structure progress (before
30 December 2019 or around), paying 40% of the tentative total transaction price (tax included); (issuing construction progress report by supervisor) 

  

	 	•	 	 Project capping (before 30 June 2020 or around), paying 10% of the tentative total transaction price (tax
included); (issuing construction progress report by supervisor) 

  

	 	•	 	 Commencement of fine decoration (before 30 September 2020 or around), paying 10% of the tentative total
transaction price (tax included); (issuing commencement order of fine decoration) 

  

	 	•	 	 Completion (before 30 December 2020 or around), paying 10% of the tentative total transaction price (tax
included); (acceptance certificate) 

  

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	 	•	 	 Delivery (before 30 September 2021 or around), paying 10% of the tentative total transaction price (tax
included); (giving occupation/delivery notice) 

  

	 	•	 	 If the project node of each payment stage is advanced or delayed, Party A shall advance or delay the payment time
accordingly. After a third party’s audit and issuing report, the price difference shall be adjusted according to the total transaction price (tax include). 

 

	 	•	 	 Party A undertakes to pay Party B each installment in accordance with the above agreement. Party B shall be
entitled to terminate the agreement if Party A defaults on payment and may also request Party A to continue to perform the agreement and pay liquidated damages to Party B equal to ten thousandth of the outstanding payment per day until the
outstanding payment is actually settled. 

  

	 	•	 	 Party A’s payment shall be only used for the development and construction of projects under this Agreement
before the projects hereunder deliver to Party A for its use, and shall not be used for other purposes. 

  

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	 	•	 	 Party B shall issue the receipt of payment with corresponding amount to Party A after each payment and shall
issue to Party A the invoice specially used for full value-added tax in a lump sum within 10 working days after the signing of formal commercial housing purchase and sale contract by both parties and the settlement of all payment by Party A.

 Party B expedited efficiently the relevant work relating to the commencement of supporting facilities and undertook to
deliver by 30 September 2021. Matters such as the determination of total transaction price and handling ownership registration procedures shall be conducted in accordance with clause (II) of section IV of this Agreement. Party B shall be
responsible for the handling of relevant procedures under government’s requirements and cause the ownership certificate be registered under the name of Party A. 

VI. Notice 
 All notices
relevant to this Agreement given by any party shall be served to the other party in writing at the address set forth herein. Notices may be served by hand, fax, letter and other methods: if sent by fax (proof of complete and uninterrupted fax having
been sent to the relevant fax number is required), notice shall be deemed to have been served on the next working day; if sent by letter, notice shall be deemed to have been served on the third working day after the date of delivery (subject to
postmark); if given by hand, notice shall be deemed to have been served when the other party accepts. Any party who change the contact method shall promptly notify the other party in writing, otherwise notice shall be deemed to have been served when
the other party serves it to the address set forth herein. 

  

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 For the purpose of assisting Party B in the construction of project, Party A shall appoint a
special working group as the leading unit during the term of this Agreement, responsible for liaising with each function of Party A and Party B, so that they could perform their obligations under this Agreement. Party B shall appoint
Yao Huiyue (姚慧悦) of Zhuhai China Southern Air Real Property Development Co., Ltd.(contact number: 18602050823) for liaison and providing services, helping to settle the doubts and difficulties encountered in
the process of investment, construction and production, and coordinating to deal with its relationship with government relevant departments. 

  

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 VII. Quality and warranty responsibilities 

The subject project under the agreement has warranty system. Under the relevant requirements of Zhuhai commercial housing purchase and sale
contract (both parties will enter into upon the project meets the conditions) on quality and warranty, Party B undertook that the quality complies with the requirements of quality standards, criteria, and design document of construction drawing of
the state; the quality of products of building materials, components and equipment, and materials used in installation, renovation and decoration is in line with the mandatory standards of the state and the criteria as agreed by both parties, and is
performed in accordance with the detailed warranty scope, term of warranty and warranty liabilities (see appendix 18 for details). 

VIII. Housing registration 

Both parties mutually agreed to make application for the registration of transfer of ownership of that commercial house with housing
registration authority after formal commercial housing purchase and sale contract is signed. If Party A fails to obtain the certificate of ownership due to Party B, Party B shall assume the default liability (see appendix 18 for details). 

  

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 Party A shall pay at its own expense all fees charged under the name of Party A by relevant
government authorities in the process of Party B handling the ownership certificate for Party A under the relevant requirements of government. The calculation of deed tax shall be the total transaction price excluding tax in accordance with the
provisions of tax law. Relevant certificates and licenses required for the opening of the hotel shall be handled by Party A at its own expense. 

IX. Default liabilities 

1.    This Agreement stipulates the working content and undertakings to be completed by Party A and Party B. Both parties
shall fully perform the covenants under this Agreement in good faith. If any party fails to perform the covenants hereunder, the non-breaching party may remind the breaching party of the covenants after the
occurrence of the breaching behavior. The Non-breaching party shall be entitled to terminate this Agreement if the breaching party still fails to perform the covenants after being reminded and the breaching
party shall pay the non-breaching party a liquidated damage equal to 10% of the tentative total sales price of this Agreement. If the liquidated damage is insufficient to compensate the economic loss caused
thereby, the non-breaching party shall have the right to request the breaching party to make fully compensation for the actual loss. 

  

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 2.    Party B undertook to complete each inspection and acceptance (including
but not limited to the work quality, firefighting, environmental protection and other items relating to the development of this project) by 30 September 2021 and deliver to Party A. For overdue delivery, Party A may request Party B to continue
to perform the contract and pay a liquidated damage equal to ten thousandth of the amount paid by Party A per day until it finishes the delivery. 

3.    If this Agreement fails to be performed for reasons not attributable to both parties (including force majeure,
change of policies in the government authorities or change in the requirements of laws and regulations), Party A and Party B shall negotiate in good faith and handle the loss suffered by both parties from the failure of performance of the agreement
in a fair and reasonable manner. 

  

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 X. Miscellaneous 

1.    This Agreement shall take effect from the signing date and has a term of five years. For the matters not mentioned
herein, Party A and Party B shall otherwise sign a supplemental agreement, and such supplemental agreement shall have the same legal effect as this Agreement. Any inconsistency between the provisions of the supplemental agreement and this Agreement,
the supplemental agreement shall prevail. If Party A and Party B enter into a new agreement or contract in respect of the subject project hereunder, the specific rights and obligations of both parties shall be subject to the provisions of the new
agreement or contract signed, and the relevant terms in this Agreement shall be invalid automatically. 
 2.    For any
dispute arising in the performance of this Agreement, both parties shall settle it by negotiation at first; if negotiation fails, it shall be submitted to the court where the constructed project locates having the jurisdiction and settled by
litigation. 
 This Agreement is made in six counterparts with each party holding three counterparts. 

  

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 Lists of attachments: 

Appendix 1    Business License of Zhuhai China Southern Air Real Property Development Co., Ltd. 

Appendix 2    Business Scope of Zhuhai China Southern Air Real Property Development Co., Ltd. 

Appendix 3    Land Grant Contract 

Appendix 4    Construction Land Planning Permit, Approval for Construction Use of Land 

Appendix 5    Construction Permit (foundation supporting wall, pile foundation) 

Appendix 6    Supplemental Agreement to the Investment Agreement of Zhuhai Free Trade Zone Administrative Committee and
Zhuhai China Southern Air Real Property Development Co., Ltd. on Transformation Projects of “Standard Services Research and Development and Training Center for Zhuhai International Civil Aviation” 

Appendix 7    Hotel Planning Scheme 

Appendix 8    Hotel Floor Plan 

Appendix 9    Table of electromechanical equipment system 

Appendix 10    Table of standards for fitting out works 

  

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 Appendix 11    List of kitchen equipment and installation system 

Appendix 12    Model commercial housing purchase and sale contract 

Appendix 13    Reporting of process information and feedback procedures of advice 

Appendix 14    Calculation table for tentative total transaction price 

Appendix 15    Payment procedures 

Appendix 16    Procedures of delivery and repossession 

Appendix 17    Settlement, audit and pricing procedures 

Appendix 18    Relevant terms relating to quality, warranty and handling of ownership certificate in the commercial
housing purchase and sale contract 
 Party A: China Southern Airlines Company Limited 

Legal representative (authorized representative): 

Party B: Zhuhai China Southern Air Real Property Development Co., Ltd. 

Legal representative (authorized representative): 

Date of execution:    2018 

  

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