AA 6018 then AA 5604 at Charlotte
Knoxville → Charlotte → Springfield
Timetable, Charlotte time
12:22AA 6018 from Knoxville at the gate
11:35AA 5604 to Springfield leaves the gate
23 h 13 apart on the timetable, overnight
AA 5604 leaves 23 h 13 after AA 6018 arrives on the timetable: more than half a day, so not a connection we count.