Where I'd like to sit is in one of those lay-flat pods in ultra-first-class, but alas, that will never happen. We fly coach and likely always will so that means if I want to sit with DH, I'm constantly relegated to middle-seat, when the airline chooses for us. On the rare occasion that we choose to pay for advance-selection, we usually sit separately, either aisle seats one-behind the other, or one window (me) and one aisle (DH). We never choose them in the same row because that means some poor soul is trapped in between us and it's just awkward.