UA 2809 then AA 3740 at DFW
Chicago O'Hare → Dallas-Fort Worth → Acapulco
Timetable, Dallas-Fort Worth time
13:31UA 2809 from Chicago O'Hare at the gate
11:23AA 3740 to Acapulco leaves the gate
21 h 52 apart on the timetable, overnight
AA 3740 leaves 21 h 52 after UA 2809 arrives on the timetable: more than half a day, so not a connection we count.