What key factors are being investigated in the Delta flight crash-landing in Toronto?

The investigation into the Delta flight that crash-landed upside down in Toronto is focusing on several potential contributing factors. Weather conditions, specifically snow and winds, are being examined to determine if they played a significant role in the incident. Investigators are also questioning whether the pilot had adequate visibility of the runway during the approach. Additionally, there are concerns about possible mechanical issues, particularly with the aircraft's landing gear. Authorities are working to determine whether a technical malfunction with the plane itself contributed to the crash. These multiple factors highlight the complex nature of aviation incident investigations, with answers still pending as the inquiry continues.