UA 3532 then AA 1848 at O'Hare
Knoxville → Chicago → Philadelphia
Timetable, Chicago time
18:43UA 3532 from Knoxville at the gate
16:50AA 1848 to Philadelphia leaves the gate
22 h 07 apart on the timetable, overnight
AA 1848 leaves 22 h 07 after UA 3532 arrives on the timetable: more than half a day, so not a connection we count.