DL 9951 then DL 194 at Atlanta
Queretaro → Atlanta → Barcelona
Timetable, Atlanta time
20:38DL 9951 from Queretaro at the gate
18:05DL 194 to Barcelona leaves the gate
21 h 27 apart on the timetable, overnight
DL 194 leaves 21 h 27 after DL 9951 arrives on the timetable: more than half a day, so not a connection we count.