General Hainse may be better situated to give you more details on that. NORAD is focused on North American air defence and the supreme allied commander's area of responsibility is outside of the NORAD ambit. It's almost like a division of labour. For instance, ballistic missile defence, as we deal with it at NATO, is related to ballistic missile defence of European air space. That's NATO's ambit and SACEUR's ambit.
I'll leave it at that unless you have more detailed questions about NORAD.