I don't know the exact number...but it's quite low.

We went almost 18 months before we lost our first student out of the sim due to failure to progress or pass the sim check. Since then (around May, 2006), we have had more...somewhere around five at the most.

Our program has been noted for its 'train to proficiency' attitude...something left over from TWA. Almost all of our instructors are former TWA. We have been fortunate in that the parent companies have been willing to give us extra sim time (up to two periods) and this has been enough to get most folks through.