I speak 5 languages "fluently", and of these I use three every day. With respect to French, which I speak since I was a toddler along with Greek (my Swiss... genes ), I only use it nowadays when in a francophone country or a French speaker visits us. Well, you should see how often I pause searching for words. Have mercy with crew members who, in addition, have to understand the English of passengers spoken with German, Swedish, Italian, Dutch, Polish, Greek, Serbian, Chinese, Japanese, Scottish accents, you name it!