Originally Posted by rickair7777

In the US, it carries essentially zero weight. Might be nice resume color, or interview topic of interest though.

English the language used world-wide for aviation, so that's the language you need as a pilot.

Flight attendants can get hired for language skills, and then may be selectively assigned to certain routes (I have a young friend who speaks french, she was hired for that and flies almost exclusively to France, the other FA's all very senior).