AA 3818 then DL 1709 at DFW
El Paso → Dallas-Fort Worth → Boston
Timetable, Dallas-Fort Worth time
15:45AA 3818 from El Paso at the gate
13:10DL 1709 to Boston leaves the gate
21 h 25 apart on the timetable, overnight
DL 1709 leaves 21 h 25 after AA 3818 arrives on the timetable: more than half a day, so not a connection we count.