I know you're talking about CTC Wings. I'm not sure why you still refer to the £69k as a 'training bond'
It isn't how "I refer to it," it is how
they refer to it. I believe it has implications for the recovery of tax where subsequent salary sacrifice is used to discharge "the bond."
I wasn't referring to "flexi," and indeed different programmes utilize different arrangements. In the examples of which I am aware, I believe the sum is around 12% within six months, and the balance is discharged as mentioned above, once on an employment contract.
"Flexicrew" is discussed at much length on these forums, and may well employ different arrangements. Other people will have a greater knowledge of those arrangements than I do.