Case C-314/23, Air Nostrum and Others: Judgment of the Court (Fourth Chamber) of 4 October 2024 (request for a preliminary ruling from the Audiencia Nacional – Spain) – Sindicato de Tripulantes Auxiliares de Vuelo de Líneas Aéreas (STAVLA), Ministerio Fiscal v Air Nostrum and Others (Reference for a preliminary ruling – Social policy – Equal treatment between men and women in matters of employment and occupation – Directive 2006/54/EC – Article 2(1)(e) – Concept of pay – Article 4 – Prohibition of indirect discrimination on grounds of sex)