DL 9941 then AA 1138 at Atlanta
Queretaro → Atlanta → Chicago O'Hare
Timetable, Atlanta time
19:43DL 9941 from Queretaro at the gate
16:46AA 1138 to Chicago O'Hare leaves the gate
21 h 03 apart on the timetable, overnight
AA 1138 leaves 21 h 03 after DL 9941 arrives on the timetable: more than half a day, so not a connection we count.