Korean Air had crash after crash until they forbid crew from speaking in Korean. Turns out cultural norms (highly hierarchical power structure) and honorifics were causing copilots to refrain from pointing out issues or pointing them out in an unclear way.
A Colombian airline crashed in New York after running out of fuel due to similar deference to air traffic control.
A Colombian airline crashed in New York after running out of fuel due to similar deference to air traffic control.