UA 153 then DL 2457 at LAX
Hong Kong → Los Angeles → Portland (Oregon)
Timetable, Los Angeles time
08:05UA 153 from Hong Kong at the gate
20:15DL 2457 to Portland (Oregon) leaves the gate
12 h 10 apart on the timetable
DL 2457 leaves 12 h 10 after UA 153 arrives on the timetable: more than half a day, so not a connection we count.