For a little clarification in a particular case:

Flying a business class oneworld award, but starting with two domestic AA legs in Economy (RJs) to get to YYZ to then (same day) proceed YYZ-LHR-NRT on BA.

Independant of my status, would an AA "peon" level be able to access the AA AC Lounges in the initial IAD and LGA airports?

I ask this as I'm doing an award trip with both my parents (my miles), and thus can only take one as a guest on my status.

Thanks,

Steve