UA 3694 then AA 1408 at DFW
Newark → Dallas-Fort Worth → Huatulco
Timetable, Dallas-Fort Worth time
16:07UA 3694 from Newark at the gate
10:23AA 1408 to Huatulco leaves the gate
18 h 16 apart on the timetable, overnight
AA 1408 leaves 18 h 16 after UA 3694 arrives on the timetable: more than half a day, so not a connection we count.