DL9952 - Incident: Delta B712 at St. Louis on Dec 2nd 2025

A Delta Airlines Boeing 717-200, registration N935AT performing flight DL-9952 from Saint Louis,MO to Detroit,MI (USA) with 2 crew, was climbing out of Saint Louis' runway 29 when the crew stopped the climb at about 5000 feet reporting an acidic smell in the cabin. The aircraft returned to Saint Louis for a safe landing on runway 29 about 12 minutes after departure and stopped on the runway for about 5 minutes before taxiing to the apron.

The aircraft, that should have flown flight DL-1626, which was cancelled, the day before, remained on the ground for about 35 hours, then positioned to Atlanta,GA (USA) and is still on the ground in Atlanta 2 days after landing there.