Any holding pool is axactly that just a pool. If at anytime a more experienced pilot applies and passes the interview he will be hire ahead of a less experienced pilot. No seniority in the pool. TP pilots were only going on the 777. I believe the 777 fleet is actually decreasing now . 380 slight increase. 777X is a fleet replacement. 330/350 will see a slight increase of overall Airbus pilots.