system: You are a contract-analysis assistant performing a span-extraction task. You are given an excerpt from a commercial contract and the name of a clause type to locate within it.

Return the exact text of the requested clause, copied verbatim from the excerpt — identical wording and punctuation, with no paraphrasing, summarising, explanation, or added commentary.

The excerpt is one window of a much longer contract and often will not contain the requested clause. If the requested clause does not appear in this excerpt, respond with exactly: Not found.

Output only the extracted clause text, or the exact string `Not found.` — nothing else.

user: Contract excerpt:
"""
Execution version Amendment n° 01 to the Global Maintenance Agreement ref. DS/C-3957/14 Issue 7 dated March 9t h , 2015 BETWEEN AZUL LINHAS AÉREAS BRASILEIRAS S/A AND AVIONS DE TRANSPORT REGIONAL, G.I.E. AZUL-ATR Amendment N° 1 Global Maintenance Agreement Page 1/9 Source: AZUL SA, F-1/A, 3/3/2017 Execution version TABLE OF CONTENTS: CLAUSE PAGE 1. DEFINITIONS 4 2. AMENDMENT 4 3. EFFECTIVE DATE AND DURATION 5 4. CONFIDENTIALITY 5 5. GOVERNING LAW - ARBITRATION 7 6. MISCELLANEOUS 8 AZUL-ATR Amendment N° 1 Global Maintenance Agreement Page 2/9 Source: AZUL SA, F-1/A, 3/3/2017 Execution version CONFIDENTIAL TREATMENT REQUESTED This amendment (hereinafter referred to as the "Amendment") is entered into on January 6th, 2016. BETWEEN: AZUL LINHAS AÉREAS BRASILEIRAS S/A, a company incorporated under the laws of Brazil, the registered office of which is located at Avenida Marcos Penteado de Ulhôa Rodrigues, 939 - Edif. Castello Branco Office Park - Torre Jatobá - 9° andar - CEP 06460-040 - Alphaville Industrial - Barueri - São Paulo - Brazil, identified under Cadastro Nacional de pessoa Juridica (CNPJ) number 09.296.295/0001-60. Hereafter referred to as the "Company" or "AZUL", On the one part, AND: AVIONS DE TRANSPORT REGIONAL, G.I.E., a French groupement d'intérêt économique established under articles L.251-1 to L251-23 of the French Commercial Code, whose registered office is at 1 allée Pierre Nadot, 31712 Blagnac, France identified under Corporate and Trade Register of Toulouse number 323 932 236, Hereafter referred to as the "Repairer' or "ATR", On the other part. Hereinafter individually referred to as the "Party" or collectively as the "Parties" RECITALS: WHEREAS the Repairer and the Company entered into a Global Maintenance Agreement as referenced here above (as amended and supplemented from time to time, hereafter referred to as the "GMA") for the purpose of providing the Company with Services for the maintenance of the Aircraft; and, WHEREAS in consideration of modification of the operations, the Repairer and the Company agree to amend the GMA in order to update the number of [*****] required for the invoicing; and, WHEREAS the Parties wish to amend certain provisions of the GMA upon the terms and conditions set out below. NOW THEREFORE, IT IS HEREBY AGREED AS FOLLOWS: [*****] Confidential material redacted and filed separately with the Securities and Exchange Commission. AZUL-ATR Amendment N° 1 Global Maintenance Agreement Page 3/9 Source: AZUL SA, F-1/A, 3/3/2017 Execution version CONFIDENTIAL TREATMENT REQUESTED 1. DEFINITIONS Unless otherwise defined, capitalised terms, singular or plural, used in this Amendment, shall have the same meaning ascribed thereto in the GMA. 2. AMENDMENT The following Clauses, sentences or words of the GMA are amended as follows: 2.1 Clause 12 - INVOICING AND PAYMENT TERMS (i) Clause 12.1(ii) of the GMA shall be cancelled and substituted as follow: [*****] [*****] [*****] [*****] [*****] [*****] [*****] [*****] (ii) Any other provision of Clause 12 shall remain in full force and effect. 2.2 Exhibit 14 - PRICE CONDITIONS (i) Clause 3.2 of the Exhibit 14 of the GMA shall be cancelled and substituted as follow: "3.2 Technical conditions for prices adjustment The prices set out in this Exhibit 14 shall be modified every [*****] at the occasion of the invoicing reconciliation pursuant to Clause 11 ("Reconciliation") if the Standard Operations of the [*****] Confidential material redacted and filed separately with the Securities and Exchange Commission. AZUL-ATR Amendment N° 1 Global Maintenance Agreement Page 4/9 Source: AZUL SA, F-1/A, 3/3/2017 Execution version CONFIDENTIAL TREATMENT REQUESTED Aircraft, analyzed at the time of the adjustment (all calculations are made with figures corresponding to [*****], change by more or less [*****] with respect to the estimated values of the same parameters, considered at the time of commencement of the Term. As from the date this Agreement enters into force, the Parties agree to take into account the following basic operating parameters (the "Standard Operations") as a reference for the above calculation: (i) [*****] - [*****] (ii) [*****] - [*****] (ii) Any other provision of the Exhibit 14 shall remain in full force and effect. 3. EFFECTIVE DATE AND DURATION This Amendment shall enter into force on the date of its signature by both Parties and, unless otherwise agreed upon in writing by the Parties through a subsequent amendment to the GMA, shall remain in force for the term of the referenced GMA. 4. CONFIDENTIALITY 4.1 Confidentiality obligations Unless otherwise provided in this Amendment, any Confidential Information released by either of the Parties (the "Disclosing Party") to the other Party (the "Receiving Party") shall not be released in whole or in
"""

Extract the exact clause related to "Expiration Date" from the excerpt above.

assistant: This Amendment shall enter into force on the date of its signature by both Parties and, unless otherwise agreed upon in writing by the Parties through a subsequent amendment to the GMA, shall remain in force for the term of the referenced GMA.