Well that would confirm what I'd expect. However, I used my FD number on a ticket of my girlfriend in the past without any problems. I was just wondering if I could pull off the same trick with my dad's ticket. And what would happen if KLM would find out what I was trying to do.

In a way, it's all about revenue. KLM makes about 6500 USD on one ticket and in exchange I wouldn't mind having the miles for the trip. Whether it's my dad taking it, or whether it would be myself. Beyond all that, what is the difference between transferring my dad's miles to my account and him booking an award from his account for me? Surely they understand when it's all within one household no financial transaction is involved in the matter?