AS 637 then DL 474 at Seattle
Phoenix → Seattle → Boston
Timetable, Seattle time
14:45AS 637 from Phoenix at the gate
13:40DL 474 to Boston leaves the gate
22 h 55 apart on the timetable, overnight
DL 474 leaves 22 h 55 after AS 637 arrives on the timetable: more than half a day, so not a connection we count.