Capril are you working in the management of smartlynx or for the agency in link with them?
As far as I know the conditions are :
The rate is 250 euros/d (not 9000 euros/month net). On this you can expect 2 months at home with no money during winter. On this you have to pay the tax and social security by your self.
Moreover you will not fly in business class during your travels, I don't know where you got this information. They book you a flight when they decide you to be transfered from one base to an other that's all. Ifyou want to go home during your day off the cost is for you and you have to take your luggage with you as the room at the hotel is not booked during your days off anymore.
At the moment my feeling is that smartlynx has the worst contract on the market.