UA 574 then TN 1322 at San Francisco
Boston → San Francisco → Los Angeles
Timetable, San Francisco time
12:49UA 574 from Boston at the gate
10:33TN 1322 to Los Angeles leaves the gatealso BA 1740, PR 3887, AA 6270
21 h 44 apart on the timetable, overnight
TN 1322 leaves 21 h 44 after UA 574 arrives on the timetable: more than half a day, so not a connection we count.