Right Rudder is correct Sciolistes, over the 84 months of the "bond" being repayed by your partner airline your pay is convieniently around £12k less than the direct entry salary.
If you are not with a partner airline you simply have the full direct entry salary and pay your loan yourself after tax.
As such, via both routes, YOU are definately paying any way you look at it. I'm certainly not complaining, it works out in the long run!