Yet none has mentioned the benefits of speaking the local language. Delays, diversions, technical problems, onboard safety procedures, customer service issues etc. may need to be communicated to the passengers. Having a flight crew member that speaks a mutual language with the passengers can diffuse escalating situations. French, Spanish, Italians.. it's not a given they speak English. I guess it's called service, perhaps even safety. And I am quite aware that plenty of low cost carriers couldn't give a rat's ass about that, thank you.