F9 4567 then WN 1572 at Denver
St Louis → Denver → Oakland
Timetable, Denver time
21:30F9 4567 from St Louis at the gate
20:15WN 1572 to Oakland leaves the gate
22 h 45 apart on the timetable, overnight
WN 1572 leaves 22 h 45 after F9 4567 arrives on the timetable: more than half a day, so not a connection we count.