SQ 1543 then AC 4104 at San Francisco
New York JFK → San Francisco → Las Vegas
Timetable, San Francisco time
19:31SQ 1543 from New York JFK at the gate
16:40AC 4104 to Las Vegas leaves the gatealso LH 7990, VA 8191, NZ 9226
21 h 09 apart on the timetable, overnight
AC 4104 leaves 21 h 09 after SQ 1543 arrives on the timetable: more than half a day, so not a connection we count.