UA 821 then DL 1189 at LAX
Hong Kong → Los Angeles → Denver
Timetable, Los Angeles time
19:30UA 821 from Hong Kong at the gate
18:30DL 1189 to Denver leaves the gate
23 h apart on the timetable, overnight
DL 1189 leaves 23 h after UA 821 arrives on the timetable: more than half a day, so not a connection we count.