UA 3521 then AA 3252 at Charlotte
Newark → Charlotte → Seattle
Timetable, Charlotte time
14:38UA 3521 from Newark at the gate
14:34AA 3252 to Seattle leaves the gate
23 h 56 apart on the timetable, overnight
AA 3252 leaves 23 h 56 after UA 3521 arrives on the timetable: more than half a day, so not a connection we count.