DL 990 then DL 5519 at Atlanta
New York LaGuardia → Atlanta → Tri-Cities
Timetable, Atlanta time
14:25DL 990 from New York LaGuardia at the gate
13:45DL 5519 to Tri-Cities leaves the gate
23 h 20 apart on the timetable, overnight
DL 5519 leaves 23 h 20 after DL 990 arrives on the timetable: more than half a day, so not a connection we count.