AS 2208 then DL 438 at Seattle
Billings → Seattle → Boston
Timetable, Seattle time
13:10AS 2208 from Billings at the gate
11:45DL 438 to Boston leaves the gate
22 h 35 apart on the timetable, overnight
DL 438 leaves 22 h 35 after AS 2208 arrives on the timetable: more than half a day, so not a connection we count.