AA 2870 then DL 438 at Seattle
Philadelphia → Seattle → Boston
Timetable, Seattle time
12:09AA 2870 from Philadelphia at the gate
11:45DL 438 to Boston leaves the gate
23 h 36 apart on the timetable, overnight
DL 438 leaves 23 h 36 after AA 2870 arrives on the timetable: more than half a day, so not a connection we count.