The failure rate for initial training is around 10% Most new hires make it to the sim, unless they leave for other reasons. The data is available from the AQP program. Recurrent training runs a 2-3% failure rate, with a handful more joining the "Special Track" for marginal performance. There is a lot of hype about PDT, that simply isn't true. Study regularly, embrace self-improvement, and be humble. That seems to be a successful formula for most.