AA 1218 then UA 6080 at O'Hare
Tampa → Chicago → Saginaw
Timetable, Chicago time
15:54AA 1218 from Tampa at the gate
13:25UA 6080 to Saginaw leaves the gate
21 h 31 apart on the timetable, overnight
UA 6080 leaves 21 h 31 after AA 1218 arrives on the timetable: more than half a day, so not a connection we count.