Going back to REX's predecessor Kendell, they also had the problem of F/O's with not enough command time to be promoted to the LHS. This was related to the introduction of the Metro 23 which was above the 5700kg limit of the Metro II. The only solution for those pilots was to go back to flying piston twins to get the required hours. A lot of them got the experience through GAM. I can't see how that situation has changed.