DL 9951 then DL 1397 at Atlanta
Queretaro → Atlanta → Austin
Timetable, Atlanta time
20:38DL 9951 from Queretaro at the gate
14:11DL 1397 to Austin leaves the gate
17 h 33 apart on the timetable, overnight
DL 1397 leaves 17 h 33 after DL 9951 arrives on the timetable: more than half a day, so not a connection we count.