Initially I would guess the 350 would be staffed from those already here for 6-12 months then start to take new hires. I am only basing that on what I have witnessed on the 787.
@vmax400... I believe the hold pool/ talent pool is synonymous.
@waas. Normally after the positive results from the interview I believe they start to do background checks etc.....I was told this is a 6 week process normally and then they have to factor in training slots, instructor and sim availability, how much notice you are required to give etc...
Unlike the process at Emirates the assessment seems to be valid for more than one year, as many people have been in pool for longer and were eventually successful.
It is ever changing but the emphasis seems to still be on wide-body DEC, followed by first officers. Training and recruitment for second officers seems to be pretty far down the scale and only fit into available gaps.....