F9 4307 then FX 9791 at O'Hare
Baltimore → Chicago → Anchorage
Timetable, Chicago time
11:23F9 4307 from Baltimore at the gate
04:00FX 9791 to Anchorage leaves the gate
16 h 37 apart on the timetable, overnight
FX 9791 leaves 16 h 37 after F9 4307 arrives on the timetable: more than half a day, so not a connection we count.