AA 6255 then UA 6060 at O'Hare
Sioux Falls → Chicago → Lancaster
Timetable, Chicago time
17:29AA 6255 from Sioux Falls at the gate
16:55UA 6060 to Lancaster leaves the gate
23 h 26 apart on the timetable, overnight
UA 6060 leaves 23 h 26 after AA 6255 arrives on the timetable: more than half a day, so not a connection we count.