When they do a study that asks based on what criteria do you choose your airlines I'm pretty sure the "language of announcements" falls on the bottom of the list behind important things like: service, friendliness, comfort, getting there on time, etc.

Anyway, 3 languages should be the max, 2 would be my preference. Have you guys try those Taiwan transportations? 4 freaking languages. Mandarin, Taiwanese, Hakka, and English. I mean literally everyone in Taiwan speaks Mandarin thanks to the solid education there, but to be politically correct they need 3 versions of spoken languages (only 7% of Taiwanese speak Hakka, but let's add them too), and the international language English. It's funny everytime I take the metro the announcements are so long in 4 languages.