AA 2174 then AA 1454 at Charlotte
Chicago O'Hare → Charlotte → Las Vegas
Timetable, Charlotte time
16:30AA 2174 from Chicago O'Hare at the gate
16:08AA 1454 to Las Vegas leaves the gate
23 h 38 apart on the timetable, overnight
AA 1454 leaves 23 h 38 after AA 2174 arrives on the timetable: more than half a day, so not a connection we count.