UA 3375 then UA 279 at O'Hare
St Louis → Chicago → Fort Lauderdale
Timetable, Chicago time
13:30UA 3375 from St Louis at the gate
10:52UA 279 to Fort Lauderdale leaves the gate
21 h 22 apart on the timetable, overnight
UA 279 leaves 21 h 22 after UA 3375 arrives on the timetable: more than half a day, so not a connection we count.