Read the N.T.S.B.’s interim report on Delta Flight 56

NATIONAL

SAFETY

NSPORTATION

BOARD

+

8

AVIATION

HIGHWAY

MARINE

RAILROAD

PIPELINE

Aviation Investigation Preliminary Report

Location:

Creston, WY

Accident Number:

DCA25LA276

Date & Time:

July 30, 2025, 17:23 Local

Registration:

N422DZ

Aircraft:

Airbus A330

Injuries:

2 Serious, 5 Minor, 234 None

Flight Conducted Under:

Part 121: Air carrier – Scheduled

On July 30, 2025, at 1723 mountain daylight time, Delta Air Lines flight 56, an Airbus A330-941, encountered severe turbulence while in cruise flight at an altitude of 37,000 ft near Creston, Wyoming. After determining that injuries had occurred, the flight crew diverted to Minneapolis- St Paul International airport (MSP), Minneapolis, Minnesota. After landing, 24 of the 246 passengers were evaluated by emergency medical technicians, with 18 transported to local hospitals for additional assessment; information regarding their conditions is currently unavailable. Of the 10 cabin crew members, 2 sustained serious injuries, 5 sustained minor injuries, and 3 were uninjured. None of the 3 flight crew members were injured. The airplane sustained minor damage to interior components. The airplane was operating under the provisions of Title 14 Code of Federal Regulations (CFR) Part 121 as a scheduled international passenger flight from Salt Lake City International Airport (KSLC), Salt Lake City, Utah, to Amsterdam Airport Schiphol (EHAM) in Haarlemmermeer, Netherlands.
According to the flight crew, prior to departure they had discussed the conditions along the route, noting that they could expect some weather during the climb, and that turbulence was predicted over the mountains east of SLC. They anticipated deviating after crossing the mountains. The departure was relatively smooth, until they reached the Wasatch Mountains, where they experienced some turbulence. As they passed through flight level (FL) 300, the ride had smoothed out enough to allow the cabin crew to begin service. At FL350, where they remained for about 5 minutes due to traffic, they noted that the turbulence predicted on their electronic flight bag weather application was “in the green” and they had observed only light cirrus clouds. About this time the captain turned off the seatbelt sign. As the climb continued to FL370, they noticed some weather buildups and requested a right deviation from air traffic control (ATC). ATC suggested a left turn to a heading of 350°. The crew assessed that heading would keep them above the cloud deck, upwind of weather buildups, and they had not heard

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This information is preliminary and subject to change.

DCA25LA276