AA 4997 then DL 438 at Seattle
Los Angeles → Seattle → Boston
Timetable, Seattle time
13:00AA 4997 from Los Angeles at the gate
11:45DL 438 to Boston leaves the gate
22 h 45 apart on the timetable, overnight
DL 438 leaves 22 h 45 after AA 4997 arrives on the timetable: more than half a day, so not a connection we count.