Boeing’s Backwards 747 Breakthrough

Warning sirens blasted across a Boeing factory in 1987 when engineers discovered a massive mistake.

They had built an entire 747 jumbo jet backwards. The tail was where the nose should

be. It took six months and millions of dollars to fix. But here's the kicker.

During the reversal process, they accidentally invented a new wing design that improved

fuel efficiency by eight percent. Sometimes the biggest failures lead to the greatest innovations

in aviation history.