AA 4191 then FX 9791 at O'Hare
Rochester (ROC) → Chicago → Anchorage
Timetable, Chicago time
12:37AA 4191 from Rochester (ROC) at the gate
04:00FX 9791 to Anchorage leaves the gate
15 h 23 apart on the timetable, overnight
FX 9791 leaves 15 h 23 after AA 4191 arrives on the timetable: more than half a day, so not a connection we count.