UA 728 then AA 3735 at DFW
Denver → Dallas-Fort Worth → Gainesville
Timetable, Dallas-Fort Worth time
16:39UA 728 from Denver at the gate
08:30AA 3735 to Gainesville leaves the gate
15 h 51 apart on the timetable, overnight
AA 3735 leaves 15 h 51 after UA 728 arrives on the timetable: more than half a day, so not a connection we count.