All airlines pay you during line training because you are actually working. The thing is, if you have payed 30k, getting payed 1300 per month is a joke. Let alone the fact that you have to pay for all your expenses, uniform and living expenses until you start the line training. Nowhere in the world do they charge the 737 TR for 30k. The explanation is simple. A part of the 30k is used for your salaries during the line training. In other words, you pay for own salaries and you work for them for free.