AA 3405 then UA 5609 at O'Hare
Syracuse → Chicago → Appleton
Timetable, Chicago time
20:18AA 3405 from Syracuse at the gate
20:15UA 5609 to Appleton leaves the gate
23 h 57 apart on the timetable, overnight
UA 5609 leaves 23 h 57 after AA 3405 arrives on the timetable: more than half a day, so not a connection we count.