BA 873 then BA 223 at Heathrow
Krakow → London → Nashville
Timetable, London time
13:40BA 873 from Krakow at the gate
13:10BA 223 to Nashville leaves the gate
23 h 30 apart on the timetable, overnight
BA 223 leaves 23 h 30 after BA 873 arrives on the timetable: more than half a day, so not a connection we count.