AA 3523 then FX 9791 at O'Hare
Baltimore → Chicago → Anchorage
Timetable, Chicago time
12:59AA 3523 from Baltimore at the gate
04:00FX 9791 to Anchorage leaves the gate
15 h 01 apart on the timetable, overnight
FX 9791 leaves 15 h 01 after AA 3523 arrives on the timetable: more than half a day, so not a connection we count.