AC 20 then DL 3943 at Vancouver
Singapore → Vancouver → Seattle (SEA)
Timetable, Vancouver time
07:45AC 20 from Singapore at the gate
07:15DL 3943 to Seattle (SEA) leaves the gate
23 h 30 apart on the timetable, overnight
DL 3943 leaves 23 h 30 after AC 20 arrives on the timetable: more than half a day, so not a connection we count.