DL 9951 then DL 836 at Atlanta
Queretaro → Atlanta → Phoenix
Timetable, Atlanta time
20:38DL 9951 from Queretaro at the gate
16:25DL 836 to Phoenix leaves the gate
19 h 47 apart on the timetable, overnight
DL 836 leaves 19 h 47 after DL 9951 arrives on the timetable: more than half a day, so not a connection we count.