AA 1276 then DL 1507 at Atlanta
Dallas-Fort Worth → Atlanta → Tri-Cities
Timetable, Atlanta time
12:42AA 1276 from Dallas-Fort Worth at the gate
11:59DL 1507 to Tri-Cities leaves the gate
23 h 17 apart on the timetable, overnight
DL 1507 leaves 23 h 17 after AA 1276 arrives on the timetable: more than half a day, so not a connection we count.