AS 619 then UA 1646 at San Francisco
Seattle → San Francisco → Baltimore
Timetable, San Francisco time
21:43AS 619 from Seattle at the gatealso DE 5004, AA 9409
21:30UA 1646 to Baltimore leaves the gatealso NZ 9032
23 h 47 apart on the timetable, overnight
UA 1646 leaves 23 h 47 after AS 619 arrives on the timetable: more than half a day, so not a connection we count.