The informations you received are not totally corrects.
After the payment of the social (pension and some others around 11% on the employee side) the income taxation vary from 23 to 43 ( above 75k ) with some detractions.
The basic salary is taxable (social and income tax) for the 100% of its amount. The guarantee Flight Allowance that is also part of the salary is taxable (social and income tax ) only for the 50% of its amount. In other words 50% of it is Net.