UA 1564 then AA 3740 at DFW
Washington → Dallas-Fort Worth → Acapulco
Timetable, Dallas-Fort Worth time
15:14UA 1564 from Washington at the gate
09:45AA 3740 to Acapulco leaves the gate
18 h 31 apart on the timetable, overnight
AA 3740 leaves 18 h 31 after UA 1564 arrives on the timetable: more than half a day, so not a connection we count.