UA 3910 then B6 2780 at Houston
Washington → Houston → Fort Lauderdale
Timetable, Houston time
14:30UA 3910 from Washington at the gate
12:45B6 2780 to Fort Lauderdale leaves the gate
22 h 15 apart on the timetable, overnight
B6 2780 leaves 22 h 15 after UA 3910 arrives on the timetable: more than half a day, so not a connection we count.