AA 3565 then UA 3914 at O'Hare
Syracuse → Chicago → Houston
Timetable, Chicago time
07:31AA 3565 from Syracuse at the gate
20:30UA 3914 to Houston leaves the gate
12 h 59 apart on the timetable
UA 3914 leaves 12 h 59 after AA 3565 arrives on the timetable: more than half a day, so not a connection we count.