BR 642 then UA 1555 at O'Hare
Anchorage → Chicago → Oklahoma City
Timetable, Chicago time
08:55BR 642 from Anchorage at the gate
21:25UA 1555 to Oklahoma City leaves the gate
12 h 30 apart on the timetable
UA 1555 leaves 12 h 30 after BR 642 arrives on the timetable: more than half a day, so not a connection we count.