My sister and brother-in-law wanted to go from EWR-LHR on my miles. I told them I could not get them seats together. My brother-in-law was in economy and my sister in First (PMUA 3 class). A perfect day when you can make your sister really happy and your brother-in-law miserable. (In justice, he was a teacher and traveling with his students so he had to sit in Y with them, but he did not know I put my sister in F).