DL 4654 then BA 226 at Atlanta
Knoxville → Atlanta → London
Timetable, Atlanta time
09:44DL 4654 from Knoxville at the gate
22:15BA 226 to London leaves the gate
12 h 31 apart on the timetable
BA 226 leaves 12 h 31 after DL 4654 arrives on the timetable: more than half a day, so not a connection we count.