Case C-74/19: Judgment of the Court (Fourth Chamber) of 11 June 2020 (request for a preliminary ruling from the Tribunal Judicial da Comarca de Lisboa — Juízo Local Cível de Lisboa — Juiz 18 — Portugal) — LE v Transport Aéreos Portugueses SA (Reference for a preliminary ruling — Air transport — Regulation (EC) No 261/2004 — Article 5(3) — Article 7(1) — Compensation to passengers in the event of denied boarding and of cancellation or long delay of flights — Exemption — Concept of ‘extraordinary circumstances’ — Unruly passengers — Possibility of relying on the occurrence of an extraordinary circumstance in respect of a flight not affected by that circumstance — Concept of ‘reasonable measures’)