DL684 - Incident: Delta B739 and Delta A321 at Atlanta on Mar 30th 2022

A Delta Airlines Boeing 737-900, registration N870DN performing flight DL-684 from New York JFK,NY to Atlanta,GA (USA), had already gone around once on approach to Atlanta's runway 08L due to weather and was on a second approach to runway 09R, when the crew decided again to go around due to weather and to divert to Augusta,GA (USA). Tower cleared the aircraft to turn right onto a heading of 170 degrees and to climb to 4000 feet at 21:57L (01:57Z Mar 31st).

A Delta Airlines Airbus A321-200, registration N329DN performing flight DL504 from Boston,MA to Atlanta,GA (USA), had been on approach to runway 09R preceding DL-684, went around due to weather as well, climbed to 4000 feet on ATC clearance and joined a downwind south of the runway in contact with Approach frequency.

While DL-684 climbed out to 4000 feet the separation between the aircraft reduced to about 200 feet vertical and less than 0.8nm horizontal according to FAA radar data when the crew initiated a descent, tower instructed the Boeing down to 6000 ah 3000 feet no delay. The Boeing crew descended the aircraft to 3000 feet and reported they had a TCAS advisory. DL-504 chimed in on tower frequency asking which frequency they should be on but was told "standby". The aircraft became clear of conflict, DL-684 was cleared to climb to 4000 feet again and received vectors to Augusta. DL-504 landed safely on Atlanta's runway 09R about 12 minutes after the loss of separation, DL-684 landed safely on Augusta's runway 17 about 30 minutes after the loss of separation.

The Boeing completed the flight the following day departing Augusta and landing in Atlanta with a delay of about 18 hours.

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