The complete loss of a large transport airplane like a Boeing 737 usually brings out the NTSB in force. That was the case with Transair 810. The initial NTSB headquarters Search and Recovery team arrived in Honolulu the day of the accident and got started promptly. The team made arrangements to find and recover the wreckage. The Operations and Human Performance and Air Traffic groups arrived the next day. Other groups formed later. A crash of this type could have been a major (Class 1) investigation, but it was eventually rated as Class 2.

https://aviationweek.com/business-aviation/safety-ops-regulation/emergency-trust-verify-part-2

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