AA 2489 then FX 9791 at O'Hare
Baltimore → Chicago → Anchorage
Timetable, Chicago time
08:45AA 2489 from Baltimore at the gate
04:00FX 9791 to Anchorage leaves the gate
19 h 15 apart on the timetable, overnight
FX 9791 leaves 19 h 15 after AA 2489 arrives on the timetable: more than half a day, so not a connection we count.