UA 231 then AA 3129 at Charlotte
Denver → Charlotte → Jacksonville
Timetable, Charlotte time
15:16UA 231 from Denver at the gate
15:02AA 3129 to Jacksonville leaves the gate
23 h 46 apart on the timetable, overnight
AA 3129 leaves 23 h 46 after UA 231 arrives on the timetable: more than half a day, so not a connection we count.