Final answer:
The year with the lowest number of air fatalities between 1966 and 1976 was 1976, with 15 passengers killed.
Step-by-step explanation:
The year between 1966 and 1976 with the lowest number of air fatalities is 1976, with 15 passengers killed. This information is derived from historical data regarding air safety incidents and fatalities. Although air travel is largely considered safe, especially with the increase in government safety regulations and improvements in technology, these early years still experienced fatal incidents, underscoring the importance of continuous enhancements in air safety protocols.