AC 4121 then TP 4392 at San Francisco
Ontario → San Francisco → Boston
Timetable, San Francisco time
10:55AC 4121 from Ontario at the gate
06:00TP 4392 to Boston leaves the gate
19 h 05 apart on the timetable, overnight
TP 4392 leaves 19 h 05 after AC 4121 arrives on the timetable: more than half a day, so not a connection we count.