UA 1309 then DL 437 at LAX
Chicago O'Hare → Los Angeles → Boston
Timetable, Los Angeles time
11:29UA 1309 from Chicago O'Hare at the gate
10:59DL 437 to Boston leaves the gate
23 h 30 apart on the timetable, overnight
DL 437 leaves 23 h 30 after UA 1309 arrives on the timetable: more than half a day, so not a connection we count.