I've booked an award flight on AA metal : ORD-BRU on AA88. The AA website indicates that the aircraft is a 767. The flight leaves Chicago at 17:40 hrs and arrives the next day in Brussels at 08:50 hrs. I like the best possibility to sleep so I booked in C-class. Which seat is the best? Or should I use miles to upgrade to F? Your thoughts and comments are most appreciated.