AA 2124 then UA 5901 at O'Hare
Indianapolis → Chicago → Syracuse
Timetable, Chicago time
06:01AA 2124 from Indianapolis at the gate
18:20UA 5901 to Syracuse leaves the gate
12 h 19 apart on the timetable
UA 5901 leaves 12 h 19 after AA 2124 arrives on the timetable: more than half a day, so not a connection we count.