UA 396 then UA 447 at Denver
Lexington → Denver → Knoxville
Timetable, Denver time
10:20UA 396 from Lexington at the gate
10:15UA 447 to Knoxville leaves the gate
23 h 55 apart on the timetable, overnight
UA 447 leaves 23 h 55 after UA 396 arrives on the timetable: more than half a day, so not a connection we count.