UA 2780 then DM 5421 at O'Hare
Los Angeles → Chicago → Punta Cana
Timetable, Chicago time
22:59UA 2780 from Los Angeles at the gate
11:10DM 5421 to Punta Cana leaves the gate
12 h 11 apart on the timetable, overnight
DM 5421 leaves 12 h 11 after UA 2780 arrives on the timetable: more than half a day, so not a connection we count.