The Delta Airbus A350-900 that collided with a CRJ-900 in September returned to service last week. Registered as N503DN, the 7-year-old aircraft was grounded for over four months while undergoing repairs.
On Sept. 10, the A350 and an Endeavor Air CRJ-900 collided on an Atlanta taxiway, damaging both aircraft. The A350 was headed to Tokyo Haneda before the crew opted to reposition the aircraft to resolve a technical issue.
According to the National Transportation Safety Board’s preliminary report, the A350’s ride-side wingtip then struck the CRJ’s vertical stabilizer. “Substantial damage” was reported on the regional jet, which was holding short of runway 8R awaiting takeoff, while the A350 suffered “minor damage,” investigators stated.

One flight attendant on board the CRJ reported minor injuries. The NTSB is continuing its investigation of the incident.
Flightradar24 ADS-B data indicates that N503DN completed a test flight Thursday before operating flight 898 to Los Angeles on Saturday.
As for the CRJ, it remains grounded at the time of writing.