Judgment of the Court (Fourth Chamber) of 22 April 2021.#WZ v Austrian Airlines AG.#Request for a preliminary ruling from the Landesgericht Korneuburg.#Reference for a preliminary ruling – Air transport – Compensation and assistance to passengers in the event of denied boarding and of cancellation or long delay of flights – Regulation (EC) No 261/2004 – Article 6 – Delayed flight – Article 8(3) – Diversion of a flight to an airport serving the same town, city or region – Concept of ‘cancellation’ – Extraordinary circumstances – Compensation to passengers in the event of cancellation or long delay of flights in arrival – Obligation to bear the cost of transferring passengers from the actual airport of arrival to the airport for which the booking was made.#Case C-826/19.