translate English to French: At an individual charge level airports allocate many shared costs and develop different activity-based costing models; the single-till approach is inconsistent with the concept of cost-relatedness; and providing cost per each category of charge would be costly particularly for smaller airports.
Telle redevance tarifée par un aéroport recouvre plusieurs frais répartis en application de différents modèles de facturation variables selon les activités. La fixation globale des redevances ("single till") est incompatible avec la notion d'imputation des coûts.