UA 568 then AA 3740 at DFW
Denver → Dallas-Fort Worth → Acapulco
Timetable, Dallas-Fort Worth time
12:44UA 568 from Denver at the gate
11:23AA 3740 to Acapulco leaves the gate
22 h 39 apart on the timetable, overnight
AA 3740 leaves 22 h 39 after UA 568 arrives on the timetable: more than half a day, so not a connection we count.