LF 8443 then UA 590 at O'Hare
MQY → Chicago → Denver
Timetable, Chicago time
09:24LF 8443 from MQY at the gate
21:47UA 590 to Denver leaves the gate
12 h 23 apart on the timetable
UA 590 leaves 12 h 23 after LF 8443 arrives on the timetable: more than half a day, so not a connection we count.