CA 1011 then UA 938 at O'Hare
Anchorage → Chicago → London
Timetable, Chicago time
04:54CA 1011 from Anchorage at the gate
21:50UA 938 to London leaves the gate
16 h 56 apart on the timetable
UA 938 leaves 16 h 56 after CA 1011 arrives on the timetable: more than half a day, so not a connection we count.