Cloud-9, I think you need to get in very quickly on this one. I do believe that there is a specific clause in the Great Repeal Bill which will invalidate access, in the UK, to the ‘European Law on the Rights of EU Citizens to Substantial Redress for Lost Skis and the Associated Emotional Trauma of Having to Use Inferior Equipment in Front of Your Friends When on the Piste” – also abbreviated as the ‘Primum Problema Orbis Law’.
I find that an unhelpful comment. If you think you are being clever, well you’re not – to a serious skiier, using inferior equipment will mean not skiing to full potential and thus a loss of enjoyment.
OP, I’m afraid I am not aware of any legislation that will assist, unless the skis are permanently lost.
Maybe one of the lawyers on the forum could point you in the right direction of information as to whether your son could hire the right type of equipment (if it is available in the resort) and then chargeback the airline or even take action for ‘loss of enjoyment’ and recover that way.
I hope that the airline swiftly delivers his skis, so he can enjoy the holiday.