SQ 1543 then AA 1401 at San Francisco
New York JFK → San Francisco → Dallas-Fort Worth
Timetable, San Francisco time
19:31SQ 1543 from New York JFK at the gate
15:45AA 1401 to Dallas-Fort Worth leaves the gatealso QF 4572
20 h 14 apart on the timetable, overnight
AA 1401 leaves 20 h 14 after SQ 1543 arrives on the timetable: more than half a day, so not a connection we count.