I booked SFO to FRA via LHR. Return from FRA via North Carolina to SFO for this summer.
Now I am thinking of breaking at LHR and spending a few nights in London. At LHR, there is only 2hrs between AA and BA flights - unsure if terminal change needed. More importantly we wanted to see London too.

We will only have one carry one each, at this time. And have priority boarding on AA. It is an award booking.

Wondering how it might play out? What should I say if I had to call AA?