Information on 15 year old travelling unattended with Aer Lingus?

I am going to spain to visit my auntie.I am flying with Aer Lingus.I am travelling unattended.I know my mam has to sign a form of indeminity but is there anything else I have to do before I travelling.Will I have to inform aer lingus before I fly that I am flying unattended ?
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