DL 706 then UA 214 at Atlanta
Denver → Atlanta → Houston
Timetable, Atlanta time
18:01DL 706 from Denver at the gate
17:00UA 214 to Houston leaves the gate
22 h 59 apart on the timetable, overnight
UA 214 leaves 22 h 59 after DL 706 arrives on the timetable: more than half a day, so not a connection we count.