The underlying estimates and assumptions are based on historical experience and on the basis of the information available, or situations prevalent at the date of preparation of the accounts. Depending on changes in those assumptions and situations, estimated amounts accounted in the financial statements could differ from actual values. Such estimates and assumptions used for the preparation of the financial statements concern essentially: ◆ the valuation at fair value of the assets acquired and liabilities taken on as part of a business combination (see Note 2.1); ◆ pension plans, termination benefits and other post-employment benefits (see note 5); ◆ impairment tests of non-current assets and impairment tests of Investments in joint associates or joint ventures (see paragraph 4.9.2); ◆ provisions for risks and litigations (see note 8); ◆ the fair value of investment property (see paragraph 6.3.2). 1.2 Accounting policies Adopted IFRS as endorsed by the EU The Group’s financial statements are prepared in accordance with International Financial Reporting Standards (IFRS) and IFRIC interpretations as adopted by the European Union as at 31 December 2017. These standards are available on the European Commission’s web site at the following address: and-auditing/company-reporting/financial-reporting_en#ifrs-financial- statements These accounting principles do not differ from the International Financial Reporting Standards issued by the IASB, insofar as the standards and interpretations published by the IASB, but have not yet been approved by the European Union, do not have any significant impact on the consolidated financial statements of Groupe ADP. Standards, amendments and interpretations that have been endorsed by the EU and mandatory as from 1 January 2017 Standards and amendments effective on 1 January 2017 and that have not been applied earlier by the Group are the following: ◆ amendments to IAS 7 – proposed amendment under disclosure initiative (issued in January 2016); ◆ amendments to IAS 12 – Recognition of deferred tax assets for unrealised loss (issued in January 2016). The impact of these new amendments is considered immaterial on the consolidated financial statements. Standards, amendments and interpretations that have been endorsed by the EU and applicable after 1 January 2017 and not early adopted by the Group The Group has not applied the following standards, amendments and interpretations that are not applicable in 2017 but should subsequently be mandatory: ◆ IFRS 15 – Revenue from contracts with customers (issued in May 2014) and amendments to IFRS 15 – Date of entry into force (issued in September 2015). This standard will replace IAS 18 Revenue and IAS 11 Construction Contracts. This standard has been endorsed by the European Union on 22 September 2016 and must be applied from 2018 onwards; ◆ clarifications to IFRS 15 (issued in April 2016). The objective of this project is to clarify the guidance in IFRS 15 in respect of issues

arising from the discussions of the TRG (Transition Resource Group). These topics are mainly related to the identification of performance obligations, distinction between principal versus agent and licenses. These standards have been endorsed by the European Union in October 2017 must be applied from 2018 onwards; ◆ IFRS 16 – Leases (issued in January 2016). This standard will replace the standard IAS 17 as well as related IFRIC Interpretation 4, SIC 15 and SIC 27. This standard has been endorsed by the European Union in October 2017 and must be applied from 2019 onwards; ◆ IFRS 9 - Financial Instruments (issued in July 2014). This standard deals with classification and measurement of financial instruments, impairment of financial instruments and hedge accounting. IFRS 9 will replace IAS 39 Financial Instruments and has been endorsed by the European Union on 22 November 2016. This standard must be applied from 2018 onwards; ◆ amendments to IFRS 2 – classification and measurement of share- based payment transactions (issued in June 2016); ◆ annual improvements to IFRS Standards 2014-2016 cycle (issued in December 2016); ◆ IFRIC Interpretation 22 – Foreign currency transactions and advance consideration (issued in December 2016); ◆ IFRIC Interpretation 23 – Uncertainty over income tax treatment (issued in June 2017); ◆ amendments to IAS 40 – Transfers of Investment Property (issued in December 2016); ◆ amendments to IFRS 9 – Prepayment features with negative compensation (issued in October 2017); ◆ amendments to IAS 28 – Long-term interests in associates and joint ventures (issued in October 2017). Estimated impacts of standards effective as from 2018 The standard IFRS 15 – Revenue from contracts with customers will be applied as from 1 January 2018 retrospectively. In this context, Groupe ADP carried out an analysis of its revenue to assess the impact of the application of this new standard on its scope of consolidation, excluding TAV Airport sub-group as it has been acquired during the second semester 2017. Findings on the analysis showed that there will be a limited impact on the scope examined. Indeed, this standard will have no impact on: ◆ airport fees and Ancillary fees recognition; the related services are consumed on short cycles and the regulated prices reflect the stand- alone selling price of each service; ◆ revenue recognition from airport safety and security services, received from the “ Direction Générale de l’Aviation Civile ” (DGAC); These services being analysed as a whole performance obligation corresponding to a series of distinct goods or services that are substantially the same and that have the same pattern of transfer to the customer which is a performance obligation satisfied over time. Furthermore, the revenue must be recognised for the gross amount as Aéroports de Paris SA is primarily responsible for fulfilling its public service mission reimbursed by the DGAC; ◆ revenue from retail activities, rental income and revenue from car parks as those activities are recorded under the scope of IAS 17 – Leases. Methodology changes to be forecast considering this new standard are mainly related to long-term contracts: ◆ design and consulting services provided by ADP Ingénierie, these services will be recorded using the completed-contract method under IFRS 15 instead of the current percentage-of-completion method;



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