UA 2788 then AA 3752 at O'Hare
Las Vegas → Chicago → White Plains
Timetable, Chicago time
19:30UA 2788 from Las Vegas at the gate
19:28AA 3752 to White Plains leaves the gate
23 h 58 apart on the timetable, overnight
AA 3752 leaves 23 h 58 after UA 2788 arrives on the timetable: more than half a day, so not a connection we count.