Reporting of noise-related costs in the financial statements 

The reporting of noise-related costs in the financial statements is a complex matter due to a multitude of relevant legal bases, unclear or pending case law and political debate. Especially in the case of formal expropriations, this financial reporting requires significant assumptions and estimates concerning the capitalisation of such intangible assets and the obligation to recognise provisions for the related costs.

Zurich Airport Ltd. has received a total of around 20,000 noise-related claims for compensation, of which just over 5,000 were still pending at the end of 2024. Around 480 of these cases are currently being examined by the Swiss Federal Assessments Commission.

The rulings by the Swiss Federal Supreme Court in the first half of 2008 on fundamental issues related to formal expropriations enabled Zurich Airport Ltd. to estimate the total cost of compensation for formal expropriations for the first time, in spite of the remaining uncertainties regarding the accuracy of this estimate. In further rulings in 2010, the Swiss Federal Supreme Court definitively set the cut-off date for the foreseeability of an eastern approach as 1 January 1961 and, in 2011, it ruled definitively on the method used to calculate a decline in the market value of investment property. In 2016, the Swiss Federal Supreme Court handed down two rulings in test cases regarding claims for compensation relating to eastern and southern approach routes and, in 2018, it handed down two rulings in test cases regarding cooperative ownership. In November 2019, the Swiss Federal Supreme Court handed down a ruling in test cases regarding the period of limitation on claims for compensation in Oberglatt. Based on these Swiss Federal Supreme Court rulings and other fundamental issues that have been decided, the Zurich Airport Group undertook a reappraisal of costs for formal expropriations at these dates, which in each case led to an adjustment to both the provision for formal expropriations and the intangible asset from the right of formal expropriation.

As at the reporting date, the estimated costs for formal expropriations remained unchanged at CHF 330.0 million, of which CHF 90.2 million had already been paid out at that date. As at 31 December 2024, a provision for the outstanding costs was recognised at their present value (see note 19, Provision for formal expropriations plus sound insulation and resident protection).

Depending on future legal judgements, including with respect to the southern approaches at Zurich Airport, noise-related liabilities may in future be subject to substantial adjustments, which would also require adjustments in the balance sheet. At the present time, a definitive assessment is not possible.

With respect to sound insulation and resident protection measures, the Federal Office of Civil Aviation (FOCA) required Zurich Airport Ltd., in connection with its 2014 operating regulations application, to submit an extended sound insulation programme. In June 2015, based on the sound insulation programme submitted, the Board of Directors approved a further CHF 100.0 million of measures in addition to the CHF 240.0 million of costs previously estimated for sound insulation and resident protection. The company is also required to implement sound insulation measures in the area where it claims exemptions from noise limits (emission limit). In this context, the FOCA initiated a night-time noise abatement procedure. The area with exemptions under the Sectoral Aviation Infrastructure Plan adopted by the Federal Council in August 2017 was extended. In this context in mid-2018, Zurich Airport Ltd. recognised a provision for further costs of CHF 60.0 million, in addition to the costs previously estimated for sound insulation and resident protection.

As at the reporting date, the estimated costs for sound insulation and resident protection measures remained unchanged at CHF 400.0 million, of which CHF 329.3 million had already been paid out at that date. As at 31 December 2024, a provision for the outstanding costs was recognised at their present value (see note 19, Provision for formal expropriations plus sound insulation and resident protection).