Has The Boeing 767 Program Been Successful?

This September will mark 44 years since the Boeing 767 took to the skies for the first time. Since its maiden flight in 1981, after which it entered service a year later with United Airlines, the 767 has become one of the most reliable and widely used widebody twinjets in the history of commercial aviation. This is evidenced by the fact that, more than four decades later, certain variants remain in production.