UA 2370 then AA 4229 at O'Hare
Sacramento → Chicago → Knoxville
Timetable, Chicago time
13:15UA 2370 from Sacramento at the gate
13:14AA 4229 to Knoxville leaves the gate
23 h 59 apart on the timetable, overnight
AA 4229 leaves 23 h 59 after UA 2370 arrives on the timetable: more than half a day, so not a connection we count.