UA 1963 then UA 447 at Denver
Charlotte → Denver → Knoxville
Timetable, Denver time
10:30UA 1963 from Charlotte at the gate
10:15UA 447 to Knoxville leaves the gate
23 h 45 apart on the timetable, overnight
UA 447 leaves 23 h 45 after UA 1963 arrives on the timetable: more than half a day, so not a connection we count.