QR 8187 then UA 2221 at Houston
Chicago → Houston → Miami
Timetable, Houston time
18:51QR 8187 from Chicago at the gate
08:00UA 2221 to Miami leaves the gate
13 h 09 apart on the timetable, overnight
UA 2221 leaves 13 h 09 after QR 8187 arrives on the timetable: more than half a day, so not a connection we count.