TP 4399 then F9 1850 at San Francisco
Boston → San Francisco → Las Vegas
Timetable, San Francisco time
20:55TP 4399 from Boston at the gate
09:14F9 1850 to Las Vegas leaves the gatealso Y4 2264
12 h 19 apart on the timetable, overnight
F9 1850 leaves 12 h 19 after TP 4399 arrives on the timetable: more than half a day, so not a connection we count.