29However, while a provision such as that the tenor of which is set out in paragraph 21 of this judgment is likely to entail a difference in treatment according to the date of recruitment by the employer concerned, such a difference is not, directly or indirectly, based on age or on an event linked to age. It is the experience which may have been acquired by a cabin crew member with another airline in the same group of companies which is not taken into account for grading, irrespective of the age of that cabin crew member at the time of his or her recruitment. That provision is therefore based on a criterion which is neither inextricably (see, a contrario, Case C-499/08 Ingeniørforeningen i Danmark [2010] ECR I-9343, paragraph 23) nor indirectly linked to the age of employees, even if it is conceivable that a consequence of the application of the criterion at issue may, in some individual cases, be that the time of advancement of the cabin crew members concerned from employment category A to employment category B is at a later age than the time of advancement of staff members who have acquired equivalent experience with Tyrolean Airways.
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