UA 3532 then AA 4330 at O'Hare
Knoxville → Chicago → Springfield (SPI)
Timetable, Chicago time
18:43UA 3532 from Knoxville at the gate
13:28AA 4330 to Springfield (SPI) leaves the gate
18 h 45 apart on the timetable, overnight
AA 4330 leaves 18 h 45 after UA 3532 arrives on the timetable: more than half a day, so not a connection we count.