AA 3818 then UA 248 at DFW
El Paso → Dallas-Fort Worth → Denver
Timetable, Dallas-Fort Worth time
15:45AA 3818 from El Paso at the gate
13:40UA 248 to Denver leaves the gate
21 h 55 apart on the timetable, overnight
UA 248 leaves 21 h 55 after AA 3818 arrives on the timetable: more than half a day, so not a connection we count.