O3 199 then UA 3876 at O'Hare
Anchorage → Chicago → Miami
Timetable, Chicago time
01:59O3 199 from Anchorage at the gate
21:00UA 3876 to Miami leaves the gate
19 h 01 apart on the timetable
UA 3876 leaves 19 h 01 after O3 199 arrives on the timetable: more than half a day, so not a connection we count.