HELP!!!! How can i leave my parents???!!!!?

So I want to go and live in peru (im 15) and my mom agreed but my dad said no (they're divorced). My mom has full custody of me and even though my dad has none, if i leave to peru (no one will be coming with me), my dad will ask for custody and theyll probably give it to him since my mom let me go. But I was thinking, what if my aunt bought me a ticket and i left to go there. I mean how could my dad bring me back even if he has custody. Theyre not gonna bring USA police/fbi to come get me so what could he do? I really want to go and if you have any other suggestions (other than not to go) that would be very helpful. Im actually peruvian and have been there plenty of times. My mother wants me but she she sees how good Peru is for me so after much discussion she was willing to let me go. However, my dad, yes he loves me very much, but thats part of the problem. He's not willing to accept that Peru is best for me, and he just wants me because he loves me and wants to live with me for once. Its sweet, but if you think about it, thats a very selfish reason. He has even admited to this. And I am SURROUNDED by family in Peru. My aunt who I would live with is like my mom and she considers me her daughter, for she has no daughter, and also she raised me for a year when i was little because my mom couldnt support me that year and we have always been REALLY close. I mean, she payed over 2000 $ for my tickets and trust me shes not rich, shes actually kinda poor, but it shows how much she loves me. And 3 of my cousins live VERY near in Lima and theyre like my sisters and i love them to death; and their mom, my aunt, is an ANGEL, and one of the most caring people I have ever met. There are also TONS of other family members there who love me and will help support me. Also, what would happen if instead, my aunt just bought me a plane ticket an