UA 3913 then UA 1982 at Houston
Denver → Houston → Fort Lauderdale
Timetable, Houston time
21:22UA 3913 from Denver at the gate
12:13UA 1982 to Fort Lauderdale leaves the gate
14 h 51 apart on the timetable, overnight
UA 1982 leaves 14 h 51 after UA 3913 arrives on the timetable: more than half a day, so not a connection we count.