• A piece of the Learjet was found nearly 4 miles from the crash site.
• The left elevator was found in three pieces, indicating the plane was breaking apart before impact.
• Weather conditions, including ice and turbulence, are a key focus of the investigation.
• The co-pilot reported ice and turbulence before the crash.

The discovery of the Learjet's left elevator pieces may indicate that the plane was experiencing significant structural stress before impact, which could suggest a potential design or maintenance issue. The investigation's focus on weather conditions may also highlight the importance of pilot training and preparedness for adverse weather scenarios.