AM 978 then DL 2681 at Atlanta
Monterrey → Atlanta → Madison
Timetable, Atlanta time
10:55AM 978 from Monterrey at the gate
09:30DL 2681 to Madison leaves the gate
22 h 35 apart on the timetable, overnight
DL 2681 leaves 22 h 35 after AM 978 arrives on the timetable: more than half a day, so not a connection we count.