How clever designs helped save 80 people after their plane caught fire, lost a wing and skidded down a runway upside down

When Delta Flight 4819 from Minneapolis to Toronto landed in a fiery crash that ripped off a wing and rolled the plane upside down, panicked onlookers feared the worst. But aviation experts saw decades of aircraft safety improvements in action.

​ When Delta Flight 4819 from Minneapolis to Toronto landed in a fiery crash that ripped off a wing and rolled the plane upside down, panicked onlookers feared the worst. But aviation experts saw decades of aircraft safety improvements in action. Read More Breaking News, Latest News and Videos | CNN