UA 231 then AA 2131 at Charlotte
Denver → Charlotte → Saint Martin
Timetable, Charlotte time
15:16UA 231 from Denver at the gate
08:27AA 2131 to Saint Martin leaves the gate
17 h 11 apart on the timetable, overnight
AA 2131 leaves 17 h 11 after UA 231 arrives on the timetable: more than half a day, so not a connection we count.