UA 587 then FX 9791 at O'Hare
Santa Ana → Chicago → Anchorage
Timetable, Chicago time
13:09UA 587 from Santa Ana at the gate
04:00FX 9791 to Anchorage leaves the gate
14 h 51 apart on the timetable, overnight
FX 9791 leaves 14 h 51 after UA 587 arrives on the timetable: more than half a day, so not a connection we count.