UA 3421 then AA 5604 at Charlotte
Newark → Charlotte → Springfield
Timetable, Charlotte time
11:39UA 3421 from Newark at the gate
11:35AA 5604 to Springfield leaves the gate
23 h 56 apart on the timetable, overnight
AA 5604 leaves 23 h 56 after UA 3421 arrives on the timetable: more than half a day, so not a connection we count.