Norwegian are also losing pilots
NAS have seen more resignations than they would ideally like, the reasons are very varied and not the same as Ryanair, but churn is churn whatever the reason!!
SAS have taken a quite a few, obviously getting back to live in Scandinavia is a priority for many, but also issues such as temp contract, agency employment, lack of pension all have an impact, NAS unlike FR doesn't have the training capacity to support the level of resignations and expansion at the same time.