UA 2160 then AA 1915 at DFW
Denver → Dallas-Fort Worth → Richmond
Timetable, Dallas-Fort Worth time
10:44UA 2160 from Denver at the gate
10:34AA 1915 to Richmond leaves the gate
23 h 50 apart on the timetable, overnight
AA 1915 leaves 23 h 50 after UA 2160 arrives on the timetable: more than half a day, so not a connection we count.