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Forty-six years ago, the deadliest peacetime aviation disaster in history took place. //
After the crash, it became mandatory for pilots and air traffic controllers in most countries around the world to use standardized, hard-to-confuse terminology. Words such as "OK" were replaced with "Roger" (meaning that the receiving person acknowledges). Phrases such as "We're at takeoff" were replaced with "[Insert Flight Number] is taking off the runway [insert number]" or "[Insert Flight Number] holding short runway [insert number]".
In the moments leading up to the crash, both the first officer and flight engineer were hesitant to question Captain Van Zanten's decision to immediately go for takeoff roll due to his seniority at KLM. In a post-1977 world, airlines began to incorporate playing down the idea of a cockpit hierarchy, choosing to place more emphasis on pilot training based on team decision-making. This idea of "Crew Resource Management" (CRM), has become a mandatory requirement for cockpit crew training in North/South America (FAA) and Europe (EASA) since 2006.
http://www.project-tenerife.com/nederlands/PDF/finaldutchreport.pdf/tenerife-air-disaster-report