F9 1229 then SQ 1491 at San Francisco
Denver → San Francisco → New York JFK
Timetable, San Francisco time
11:17F9 1229 from Denver at the gate
06:00SQ 1491 to New York JFK leaves the gate
18 h 43 apart on the timetable, overnight
SQ 1491 leaves 18 h 43 after F9 1229 arrives on the timetable: more than half a day, so not a connection we count.