K4 537 then AA 1173 at O'Hare
Anchorage → Chicago → Pittsburgh
Timetable, Chicago time
23:39K4 537 from Anchorage at the gate
18:30AA 1173 to Pittsburgh leaves the gate
18 h 51 apart on the timetable, overnight
AA 1173 leaves 18 h 51 after K4 537 arrives on the timetable: more than half a day, so not a connection we count.