Case C-501/17: Judgment of the Court (Third Chamber) of 4 April 2019 (request for a preliminary ruling from the Landgericht Köln — Germany) — Germanwings GmbH v Wolfgang Pauels (Reference for a preliminary ruling — Air transport — Regulation (EC) No 261/2004 — Article 5(3) — Compensation to passengers in the event of denied boarding and of cancellation or long delay of flights — Scope — Exemption from the obligation to pay compensation — Notion of ‘extraordinary circumstances’ — Damage to an aircraft tyre caused by a foreign object lying on an airport runway)