Ah, you're right. As I typed out that last post, I actually thought to myself it seemed strange they would have this plane grounded in PIT for over 24 hours. I'll attribute my mix-up to what I think were a few equipment changes on this route in the last day. Granted it was late last night, but as best I can recall, FlightRadar was showing a different 787-10 departing LHR tomorrow afternoon. Can't recall registration, but I distinctly remember 2 years old, whereas the G-ZBLF flying today is only 1 year old. Regardless, as you note, tomorrow's flight is (as of now) set to be a 788.