MeMyself: "Swiss take over by Lufthansa ? Everyone speaks german."
I don't know if German is the official operating language in the cockpits of LH (probably not), but even so, your arguement is skewed:
- To the best of my knowledge, Swiss is still being operated as a separate airline, and there is no crew mixing.
- Not all Swiss pilots are native speakers of German.
- The differences between Swiss and German are quite substantial, and communication between educated individuals can break down over unexpected points. I would rather not depend on it to work in a safety critical enviroment.