Money !
Not yours aardvark keeper but the one the training provider (future FI employer) and the airline can save.
I suspect some cunning tax break and clever accounting with benefits that can be enjoyed by both Cabair and Buzz. Not to forget as well that Buzz knows today they can get a certain number of people in 2 years time. After all the guys will be bonded (fair enough)and with a FI's salary, quite unlikely to jump ship before that.