DL 3994 then DL 558 at Seattle
Santa Ana → Seattle → Cincinnati
Timetable, Seattle time
11:37DL 3994 from Santa Ana at the gate
11:30DL 558 to Cincinnati leaves the gate
23 h 53 apart on the timetable, overnight
DL 558 leaves 23 h 53 after DL 3994 arrives on the timetable: more than half a day, so not a connection we count.