Ah, it's good to see that Spain is once again at the tip of the spear of innovation...
Untill 2010 the trainees at Senasa got 80€ /month if they were from Madrid and 400 if they were from outside... this is basically "not paid".
And from 2010 onwards trainees at Senasa have to pay 50.000 € for the basic tower course... but don't tell that Nats or the IAA, they might wish to follow through on that