UA 728 then AA 1607 at DFW
Denver → Dallas-Fort Worth → Cleveland
Timetable, Dallas-Fort Worth time
16:39UA 728 from Denver at the gate
16:00AA 1607 to Cleveland leaves the gate
23 h 21 apart on the timetable, overnight
AA 1607 leaves 23 h 21 after UA 728 arrives on the timetable: more than half a day, so not a connection we count.