How unusual is it for a plane to land upside down with all passengers surviving?

According to Professor Ella Atkins of Virginia Tech, it's almost unheard of for a plane to land upside down with its gear in the air and have everyone survive. She describes this Delta incident as 'remarkable,' emphasizing how extremely unusual such accidents are for commercial transport aircraft during landing. Despite this rare occurrence, Professor Atkins stresses that flying remains safe today. She specifically wants to reassure the public that no one should hesitate to go to the airport and catch their next flight, reinforcing that commercial air travel continues to be a safe mode of transportation regardless of this extraordinary incident.