WN 987 then DL 842 at Atlanta
Baltimore → Atlanta → Phoenix
Timetable, Atlanta time
09:10WN 987 from Baltimore at the gate
21:15DL 842 to Phoenix leaves the gate
12 h 05 apart on the timetable
DL 842 leaves 12 h 05 after WN 987 arrives on the timetable: more than half a day, so not a connection we count.