BR 646 then UA 2638 at O'Hare
Anchorage → Chicago → Houston
Timetable, Chicago time
10:40BR 646 from Anchorage at the gate
10:34UA 2638 to Houston leaves the gate
23 h 54 apart on the timetable, overnight
UA 2638 leaves 23 h 54 after BR 646 arrives on the timetable: more than half a day, so not a connection we count.