DL 2919 then UA 412 at San Francisco
Boston → San Francisco → Mexico City
Timetable, San Francisco time
23:31DL 2919 from Boston at the gatealso SK 3585, AF 3726, LA 6228
22:48UA 412 to Mexico City leaves the gatealso AC 5025
23 h 17 apart on the timetable, overnight
UA 412 leaves 23 h 17 after DL 2919 arrives on the timetable: more than half a day, so not a connection we count.