AA 5550 then UA 3436 at Detroit
Charlotte → Detroit → Washington
Timetable, Detroit time
10:30AA 5550 from Charlotte at the gate
10:13UA 3436 to Washington leaves the gate
23 h 43 apart on the timetable, overnight
UA 3436 leaves 23 h 43 after AA 5550 arrives on the timetable: more than half a day, so not a connection we count.