In the 1970s, aircraft manufacturers developed larger wide-body aircraft for use

In the 1970s, aircraft manufacturers developed larger wide-body aircraft for use worldwide. These were initially designed and built during the period of global deregulation that was discussed in Discussion Forum 1. Many of these aircraft are still in service today. Explain how these aircraft contribute to the productivity index. Then, describe the roles they played in post-deregulation development of hub-and-spoke systems and airline mergers and acquisitions that occurred afterwards.