UA 411 then DL 1011 at Atlanta
Chicago O'Hare → Atlanta → Hartford
Timetable, Atlanta time
09:53UA 411 from Chicago O'Hare at the gate
21:54DL 1011 to Hartford leaves the gate
12 h 01 apart on the timetable
DL 1011 leaves 12 h 01 after UA 411 arrives on the timetable: more than half a day, so not a connection we count.