DL 977 then CX 7578 at San Francisco
Boston → San Francisco → Dallas-Fort Worth
Timetable, San Francisco time
11:41DL 977 from Boston at the gatealso LY 4578
11:20CX 7578 to Dallas-Fort Worth leaves the gate
23 h 39 apart on the timetable, overnight
CX 7578 leaves 23 h 39 after DL 977 arrives on the timetable: more than half a day, so not a connection we count.