UA 3532 then AA 2708 at O'Hare
Knoxville → Chicago → Houston
Timetable, Chicago time
18:43UA 3532 from Knoxville at the gate
17:10AA 2708 to Houston leaves the gate
22 h 27 apart on the timetable, overnight
AA 2708 leaves 22 h 27 after UA 3532 arrives on the timetable: more than half a day, so not a connection we count.