Iulia,
You are not a tight ar$e by asking that question. I don't think that staff CV should charge people to apply to the airlines. It is crazy!
Not only do we have to pay for all the certificates that you need to apply to the airlines anyway, then you have to pay for your suit, your hair, etc.. etc.. It gets really really expensive.
The easiest way to do it is to create new email accounts and logging into Staff CV under a new email account each time. You might end up with like 4 or 5 different email accounts, but if you keep track of them (like in a log book or whatever) that is best way to avoid those unnecessary costs.
Good luck with it all
STF