AA 2644 then K4 810 at O'Hare
Pittsburgh → Chicago → Anchorage
Timetable, Chicago time
09:05AA 2644 from Pittsburgh at the gate
04:00K4 810 to Anchorage leaves the gate
18 h 55 apart on the timetable, overnight
K4 810 leaves 18 h 55 after AA 2644 arrives on the timetable: more than half a day, so not a connection we count.