I have a lot of friends in Kentucky, and recall flying into Cincinatti from LHR years ago (1998 I believe).
I'm going to say that I think I flew the route with BA, but cannot be certain. I dare say someone can find a way of searching old routes.
My memories from the flight were:
1) It was the first time I'd ever flown long-haul by myself.
2) I had to wear my ticket and passport round my neck, and was escorted through the airport with another passenger as Unaccompanied Minors.
3) The other unaccompanied minor, was a girl who was truly beautiful (in my 13 year old eyes).
4) I was in a smaller economy cabin - I seem to recall it was split by a set of doors.
M