There are three entry doors to KLM. They are KLS (KLM's flight school), NLS (the Dutch equivalent of Oxford or BAe if you like) or ex-armed forces. Taking the flying school method means an aptitude test on the way in, keeping you nose clean on the way through and leaving with a debt of 140,000 euros or so. Then you attend the selection process of simulator, psycho, medical and interview assessments. For those leaving the armed only (?) the latter section applies. Once accepted, you are put in a holding pool and will be allocated F50, F70-100 or KoKo. Not surprisingly, fluent Dutch is a requirement, if for no other reason than to have a "social life" whilst at work even though the airline "works" in English.
PM