DL 2956 then DL 5258 at Atlanta
Philadelphia → Atlanta → Knoxville
Timetable, Atlanta time
17:53DL 2956 from Philadelphia at the gate
17:45DL 5258 to Knoxville leaves the gate
23 h 52 apart on the timetable, overnight
DL 5258 leaves 23 h 52 after DL 2956 arrives on the timetable: more than half a day, so not a connection we count.