Regarding Swiftair...
They are partly a Pay-to-Fly Airline where young, inexperienced pilots PAY the Airline over 30.000 euro just for the right to work for them a couple of months. After that, they are often kicked out and replaced by new ones.
This is certainly the case on ATR42/72. I don't know if they do this on MD83 and B737.
Pilots were from Spanair, that means they had easily 20000 and 10000h and most of them on type