UA 728 then AA 1355 at DFW
Denver → Dallas-Fort Worth → Oklahoma City
Timetable, Dallas-Fort Worth time
16:39UA 728 from Denver at the gate
13:11AA 1355 to Oklahoma City leaves the gate
20 h 32 apart on the timetable, overnight
AA 1355 leaves 20 h 32 after UA 728 arrives on the timetable: more than half a day, so not a connection we count.