UA 539 then DL 2709 at Houston
Dallas-Fort Worth → Houston → Atlanta
Timetable, Houston time
13:33UA 539 from Dallas-Fort Worth at the gate
08:05DL 2709 to Atlanta leaves the gate
18 h 32 apart on the timetable, overnight
DL 2709 leaves 18 h 32 after UA 539 arrives on the timetable: more than half a day, so not a connection we count.