UA 2802 then FX 9791 at O'Hare
Houston → Chicago → Anchorage
Timetable, Chicago time
10:11UA 2802 from Houston at the gate
04:00FX 9791 to Anchorage leaves the gate
17 h 49 apart on the timetable, overnight
FX 9791 leaves 17 h 49 after UA 2802 arrives on the timetable: more than half a day, so not a connection we count.